Tobi a part of the Jiyubi Theory
New Fresh Theory guys bear with me I DID NOT MAKE THIS THEORY, I GOT IT FROM YOUTUBE
Tobi is madara Uchiha or another form of him
First of all madara Uchiha didn't die after his battle with hashirama.Madara is simply an Imortal Shinobi as stated by Itachi.
After madara defeat by Hashirama he somehow managed to survive using izinagi. Tobi is proof Uchiha madara is immortal
Madaras real goal in fighting hashirama was to gain some of his DNA. Later madara integrated it into his body, allowing him access to wood release kekkei genkei. By mastering wood release madara could access yang release and finally master yin-yang release. When madara had access to yin-yang release, he could finally master some kinjustus such as izinagi and izinami but more important than that is the ability to use " Creation of all Things" Justsu.
So by administration of imagination and spiritual energy which forms the basis of Yin chakra. Madara created the shape, Tobi from nothingness, and by application of vitality and physical energy which forms the basis of Yang chakra. Madara could breathe life,or a portion of his life into that shape. Then by using wood element he made that body very strong,making it alive. Madara previously during the Kage fight made wood clones that could each use Susano'o at the same time soooo yah!!!!!
What did the sage of six paths do with the 10 tails he used his ability known as creation of all things to divide the 10 tails chakra into 9 parts which would become the 9 tailed beasts, while the original body of the 10 tails was sealed within the moon. Madara did the same thing he sealed his chakra within Tobi and kept his original body hidden somewhere els. The 10 tails became the 9 tailed beasts which means 9 minds from one mind and the sage of six paths gave each one a name like "Kurama". Same thing with madara who called himself Tobi.
Madara used the same Justsu to create Zetsu. White zetsu represents yang (senjustsu powers) while the black Zetsu represents yin (Uchiha powers).
In later chapters when edo madara was talking to kabuto he refered to him self as A body, he said " kabuto you said something didn't you.. Did you do something to this body....?" why would he say this body not my body??? He also says " someone like you who can't even read the stone monument of Uchiha you deciphered them?" "you bàstard...the secrets of my body". What are the secrets of his body is it the ability to split or his invulnerability, I bet it's secrets are engraved on the stone monument.
In chapter 385 itachi is talking about madara being alive. If tobi isn't madara is itachi that stupid or ignorant to say that Tobi is madara. Itachi with his MS ability could despised some of the naka shrine stones but not all but just enough to learn the identity of Tobi being madara. Also in the Kage summit when Tobi is talking to the kages he refers him self to be nothing but an empty shell of his former self and that the wounds from is battle with hashirama were too deep. Itachi also says he is a shell of his former self and is no longer worthy to be concidered the greatest Uchiha.
Chapter 560 edo madara spoke of a plan that didn't seem to be going as wished but with who??? Many believe with Tobi but but the answers is no...the plan was with Nagato whom madara gave his rinnengan too renneitensie him when Nagato collected all the tailed beasts. Didn't Tobi say that the renneitensie was ment for him..(for Tobi)??? Isn't that proof that Tobi is madara?
Let's say Tobi is a liar and he is not Madara, he lied to the 5 kages and sasuke, and dicieved kisame which doesn't seem likely. Maybe itachi isn't that smart to say that Tobi is madara but...... Could Tobi lie to black zetsu his most loyal akatsuki member??? And when he was fighting Konan he said he was madara, why would he lie to her when he was certain of her death???
Tobi is experienced in the medic field so he problably found obitos body and transplanted into himself. But if Tobi is madara why is he wearing a mask you may ask. Tobi's outfit is made of special material to protect his injured body it is also covered with bolts.... The mask he wears is made of iron or something to withstand external damages.
After his battle with hashirama madara became a loser and forgotten by the leaf villag, he was betrayed by his clan members, and failed to become hokage, and worst of all his body is severely injured. All these factors combined would make madara/Tobi feel like a "no one" or "nobody". Many think that edo tensie is proof that madara is not Tobi since the real madara was revived but if we look deep into it, it is the best proof that Tobi is madara because the only person that can reveal tobis true identity is not Tobi himself but madara Uchiha instead
And edo madara is already confirming some actions done by Tobi himself.
Tobi was shown with only normal sharingan yet he knows about the Uchiha stone secrets such as the story of the 10 tails and the sage of six paths!!!! That's because madara was able to decipher it in the past and even add to it. If Tobi wasn't madara he wouldn't have been able to decipher the naka shrine stones.
So again what are madaras body's secrets is it the ability to split of his invulnerability. Tobis secrets are also engraved on the Uchiha naka shrine stones.
In chapter 590 I predicted itachi could decipher some of the naka shrine learning that Tobi is madara.
Chapter 385 itachi clearly states madara is very much alive unfortunalty itachis MS could not desipher all of Uchiha madaras/tobis secrets only the rinnengan could.... When Tobi is talking to sasuke about the truth about itachi somewhere in there he says "fortunatly I managed to keep a few secrets from him, if I hadn't I'd be dead right now". The secret itachi couldn't decipher was problably some sort of weakness...
You may say, madara and Tobi have to completely different outlooks but.. Madara clearly states this during the Kage fight, " mankind will be better served sleeping peacefully in the infinite Tsukiyomi.
Kast point why could Kurama recognize tobis chakra you may also wonder??? In chapter 526 page 2 zetsu was able to get past the sensory ninja and they say this " an enemy, nobody sensed him" Tobi might have some of so e of black zetsus abilities because weve seen him repair his arm with something that looks like its from white zetsu.