10 tails chakra is divided yes, but there is no indication that his mind is also divided. It is made perfectly clear that chakra, mind and body are different and seperatable parts when it comes to tailed beasts (example: chapter 490 page 11). His chakra is divided to tailed beasts, body is inside the moon but nothing is said about its mind. So mind of the 10 tails might as well be somewhere around.
I might be wrong, i was merely training a thought. But your statements seem to be only emotional, assuming that a non-human demon can never be a villain. Do you read manga much ?
here is one of my earlier posts, some possibilities on what zetsu might be!!
1-unseal something, or seal something or both
2-release something, or keep something from being released or both
3-open something, or keep something locked or both
4-seperate something
5-maintain something
6-hold something off/keeping something from doing something
7-reunite something
8-hide something or reveal something, or both
9-revive something, or destroy something, or both
10-complete something
In this case, we will say that "Something" = The Ten Tailed Beast, but only in this case, it could mean other things, but i just dont have the energy to write all the possibilities!!
1-"Unseal something, or Seal something", "Seal something" probably seal the tentailed beast inside the moon, as zetsu does awfully resemble the moon lol, dark and light, moon eclipse and moonlight, and his eyes even, one of them is a full but eclipsed moon, and the other is exactly a half moon!!, "Unseal something", again probably unseal the tentailed beast, since he is the "Key", he is the tool to seal or "Unseal" the tentailed beast from the moon!!, either the whole moon is a seal for the tentailed beast or on the moon or inside the moon there is the seal of the Jyuubi!, which must be Gigantic and Extremely Powerful!!, so zetsu is the only key that can open that seal!!
"oh and by the way, its true that by the tentailed beast, i mean the tentailed beasts "Body", but there is one thing you guys have to know, what the sage of the six path did was seperate the tentailed beasts Chakra from its Body, Divide its Chakra, Spread it all around the world in the form of living beings called "The Nine Tailed Beasts", And he Sealed The Tentailed Beasts Body Inside the Moon!!, so the sage of the six paths seperated jyuubis chakra from its body, divided it, and sealed its body away!!
why go to all the trouble of sealng his body away and in such a big sealing place as the moon?, is it only because he was afraid that someone would revive it?, i think probably because the sage of the six paths olso feared that if he didnt, the tentailed beast would somehow regain his chakra!!, therefore i think the moon is not the only seal that he put on the tentailed beast, i mean sealing him on the moon was not the only thing that he did, he probably olso did somekind of very powerful seal on him to not be able to regain his chakra!! which is where number 6 comes in....
6-"hold something off/keeping something from doing something", the sage of the six paths not only sealed the tentailed beast inside the moon, but he olso did another sealing on it to keep it from regaining its chakra!!, and i believe that the Key to that Seal is "Zetsu"!!
2-"release something, or keep something from being released or both", obviously zetsu is the thing or the key that keeps the tentailed beast from being released from the moon somehow, maybe its not a seal that keeps it there but something else!, and zetsu is thing that keeps the tentailed from being released! and zetsu is olso the thing that can release it!!
3-"open something, or keep something locked or both", maybe there is something else on the moon, something very very powerful, and that thing has a Key, which is "Zetsu", so zetsu can both open it and lock it! lol
4-"Seperate something", as you can see, zetsu is half dark and half light, what it seems like is that zetsu is a "Union" of both dark and light, but it could be the oposite!, so zetsu could actually be a "Seperation" of "Dark And Light", because, i mean even though they are so close to eatchother, and they share the same body, the two "dark and light" seem very different from eatchother and very much unaffected by eatchother!!, although they are both "Evil", which is the one thing that they have in common!, but i will explain that alittle later!!, so what i mean is that zetsu could either be the thing that keeps the jyuubis chakra seperated from its body, or zetsu is the thing that keeps dark and light side seperated from the jyuubi!!, which gives me other theories....
one, that when the sage of the six paths seperated the jyuubis chakra from its body, he olso had to seperate its will which as everyone and everything else is consistent of both "dark and light", and he either put the jyuubis will inside an already existing creature "zetsu", or he Created One!!, he created Zetsu and put the two sides "dark and light" of the tentailed beast and its "Will" inside of him!!, or zetsu actually is the tentailed beast's two sides "dark and light", that Zetsu actually is the Tentailed Beasts "Will" in corporial form!!
second, yes, Zetsu is the Jyuubis "Will", and his "Dark And Light" Sides!, Kyuubi has two sides aswell, i mean even though they are both evil, one of them is Dark and one of them is Light, the light half is inside Naruto, the Dark half until now we are unsure of where it actually is!!, anyway, its only fair that the Jyuubi has has two sides two!, "Dark And Light", and its Zetsu!, i mean en the sage of the six paths seperated the Jyuubis chakra, he olso had to seperate the jyuubis will and these two sides from it!!, i mean the Jyuubi may not have a "Soul" because he is a "Demon", but he does indeed have a "Will", and the sage of the six paths Seperated that will of Jyuubis along with its "Chakra"!!, the SO6P Divided Jyuubis Chakra after seperation and Spread it all around, but he couldnt risk Spreading Jyuubis Will around, its too Evil!! and it would currupt peoples Hearts with it!!, but not only because of that, olso because...., and heres the kicker!....
the sage of the six paths put Jyuubis "Will" and "Mind" inside Zetsu for one very important reason, to seperate it from its "Body and Chakra"!!, why?, think about it, what is naruto doing right now?, his trying to seperate the Kyuubis will and mind from its chakra so that he can control the kyuubi!!, and we all know that the sage of the six paths was jinchuriki of the Jyuubi and he was completely able to control the Jyuubi!! HOW?
i mean if the kyuubi is so hard to control that even narutos great will is not enough to control him!, then how the heck was the sage of the six paths able to control the Infinetly Great And Hateful And Evil Jyuubi??, how did he overcome Jyuubis fearsome Will while trying to control him like naruto?
what i think is simple, he couldnt overcome it! and never could he!, but....
the sage of the six paths found another way so he didnt have to overcome Jyuubis will!!, Since he was a master and creator of ninjutsu, he created a jutsu to seperate Jyuubi from its "Will" and "Mind", and that "Jutsu" was "Zetsu"!!, and so, all that the sage of the six paths was left with was Jyuubis "Chakra"!!, and for some reason, Jyuubis Body!, and this raises the question....
"why and how did the sage of the six paths sealed the Jyuubis Gigantic Body Inside of himself?
How is not important right now, but Why, i think its because Jyuubis Power doesnt only lie in his Chakra!, it olso lies in his Body!!for instance i think either the rinnegan or the sharingan or both was Jyuubis!, and as we know, The Rinnegan And most certainly The Sharingan come from The "Genes", and Genes are the main Designers of the body! and not Chakra!!, so in order for the sage of the six paths to get the rinnegan and the sharingan, he needed to seal the Jyuubis Body inside of himself olso!! and so does madara!!
i mean to prove that my theory is correct, why does madara need to go to all the trouble of putting the tailed beasts chakra back in the Jyuubis body and reviving the Jyuubi ?, i mean if he wanted Jyuubis power, he could just reunite the tailed beasts chakra and make it into one chakra then seal it into himself!!, i mean the sage of the six paths seperated the jyuubis chakra "whole chakra", and "Then" divided it into nine seperate parts!, i mean all madara has to do is reunite it into one chakra and seal it in himself!, but he doesnt wanna do that, because Jyuubis chakra is not its only power! the Jyuubis Body is equally important! and thats why madara need to "Complete it"!!
5-"maintain something", probably maintain the balance between the jyuubis light and dark half!!, or between jyuubis will and chakra!!
7-"reunite something" reunite the ten tailed beasts and make them into one being! and olso to reunite them with the will of the tentailed beast!!
8-"hide something or reveal something, or both", maybe the Jyuubi is not only sealed on the moon, but his olso invisible! so there is no way to find it on the gigantic moon!, and Zetsu is the thing that keeps it hidden!, but zetsu is olso the thing that can reveal it!, zetsus dark half is whats keeping it hidden, and zetsus light half is what can reveal it!!
9-"revive something, or destroy something, or both", obviously like i said, Zetsu may be the key to reviving the Jyuubi, his the key to putting back jyuubis will and mind and chakra back inside of it!!
10-"complete something", the jyuubis power doesnt only lie in its chakra, it olso lies in its body!, so it is not a "Complete Power" without its body, for instance the body contains the Power of a "Ten Tomoed Sharingan" and a Bigger and much more Powerful "Rinnegan"!!, and that maybe one of the reasons why madara said that his plan is to be "Complete"!, and ofcourse olso because as madara said his not the same as before, and the Jyuubi would olso complete him! so basically, his planning to Complete the Jyuubi inorder to Complete himself!! and thats what the whole Moons Eye Plan seems to be! TO COMPLETE!, not to mention to "Completely" conquer the world!! lol
So now back to the possibilities on what Zetsu might be besides being the key to the tentailed beasts seal or something!
6-Zetsu might be somekind of Supernatural creature like a Dark and banished Angel or something!
7-zetsu could be jyuubis sibling or parent or creator! very unlikely! but its still a possibility! lol
8-Zetsu is exactly as he looks! dark and light like the moon, moon eclipse and moonlight, and having fully eclipsed moon eye on his right side and half moon on his left side!, he is the key to the "Moon", as many here said including myself, whenever the kyuubi attacked it seemed that there was a full moon!, maybe "Full Moon" is somehow connected to the tailed beasts! and maybe necessary somehow!, so if needed, zetsu can turn the moon full! or bring it back to normal! to control the tailed beasts probably! maybe a full moon is needed to control the tailed beasts!
but in any case if zetsu is the key to the moon, when madara gets the jyuubi inside himself, he will need the moon to be full to cast the infinite tsukuyoumi, doesnt he? and how would he keep the moon full?, i mean the moon doesnt stay full forever does it??, its funny that noone thought of this yet...., anyway, Zetsu is the key to the moon and he is key that will make the moon stay full forever!! the key to locking the moon in full mode!! and this one of my "Prophecies" because im almost sure of it, atleast its partly true!!, but in any case i will say that im sure of it just now, "right now with the information i have on the manga", and call it a Prophecy!!
9-Zetsu from an unknown origin, like forexample his from an extincted clan or rase!, or his from space or his supernatural like i said! probably a darkened angel, or a demon or mutant! or a halfbreed! etc....
10-Zetsu is the final jutsu of the mangekyou sharingan!!, in other words zetsu is either a summoning of the mangekyou sharingan or actually "a jutsu himself"!!, and he was created when madara awakened his eternal mangekyou sharingan!!, zetsu was either created as reflection or a projection of who tobi is!, tobis, will, body and mind i mean!
i mean if tobi is madara inside obitos "body" then he has like two sides, obito = light side, and madara = dark side, which is why zetsus "body" has olso two sides dark and light!!, and zetsu is evil and ambitious with the same ambition as madara because his olso a projection of madaras will and he has the same ambitions and is able to let the moon stay full because his a projection of what wants!, zetsu is very smart and calm probably olso because his a projection of madaras mind!!
or zetsu is again the key to the moon, the key that can turn the moon full at anytime, and make it stay full forever!!, but he can only be summoned or awakened once you have an eternal mangekyou sharingan!! seems very possible since the sage of the six paths had a habit of making things like this, the tablet that the SO6P left had olso to be read in different levels of the eye! the normal eye, sharingan, mangekyou sharingan, probably eternal mangekyou sharingan, and the rinnegan!!