I know it is a long Reply but i want to cover all facts as arguments, so if you take you time to read to whole think, I guess it will help you all.
First i want to say that i have been reading this blogs for some years now and never felt the need to register to join the discussion until now.
I have to admit that Kishi made some small mistakes now and then, but letting Tobi JUST be Obito would be some massive mistake. And at least until now there have been no such massive ones in Naruto, so I guess it is not JUST Obito without any additional . . . Things. And by the way i don't believe in the TWO TOBI THEORY. That would be the lamest thing ever.
Let be state some arguments why Tobi being JUST Obito would be absolutely ridiculous (I will start with the strongest arguments and will close with some smaller ones):
- Tobi obviously has to have Hashiramas Cells because he has used Izanagi and uses the Rinnegan. Where should Obito have gotten this, without help
- Tobi states that he gave the Rinnegan to Nagato in the first place and this would have obviously been before OBITOS BIRTH, so either he is a big fat liar (well i lied before i give you that) or it was not OBITO but some other part of Tobi. By the way i think the Rinnegan are originally Madaras (i.e. Izunas) Eyes. This would fit because it seems logically that only SO6P and other people with both Uchiha and Senja DNA can have Rinnegan, so Nagato was no Wonder of Nature but simply got this eyes implanted somehow.
- Tobi has a massive Knowledge of so many things that happened before Obitos Birth, so I guess he can't have figured this out all by himself
- Tobi has obviously the power to grow some new Body-parts that consist of some white substance. This reminds me of Zetsus power. So something must have happened with his body. Some change, some implantation. Of course this has maybe to do with to Hashirama DNA
- Obito was a nice guy. He envied Kakashi because he loved Rin, but when he was dying he gave Kakashi his Sharingan and he was thinking of him as a Friend. Maybe he would be angry on Kakashi because Rin died. But as far as we know this happended years after Obito was crushed, so why wouldn't he have returned to Konoha by then? There is no real explanation possibility for such a change of heart.
- Many people believed he was Madara. Especially Kisame who has also seen his face. And Kisame also saw his face just a fed Months ago and was not surprissed to see the face of Obito we saw in the last chapter. So he must have seen the same face when he first met Tobi. But why should he believe him to be Madara if there is no additional explanation to his appearance that he game Kisame. Kisame was obviously not the kind of guy who believed a half-grown brat (that obito would have been back then) just to be the most powerful Uchiha of all times without any more reason. And Itachi. He also thought of Tobi as Madara. He said he was only a shade of his former self but he was immortal. So maybe there is some Madara in Tobi... this would explain it.
- Minato should have somewhat recogniced his former student when Tobi attacked the Leaf, shouldn't he. Except when Tobi would have been some completely (mind?)-changed Obito.
- It would have been to obvious, to easy to guess from the very beginning of Tobi.
- Why should Kishi reveale the whole deal in Chapter 599? There has to be something more than just Obito that gets revealed in Chapter 600.
So let me conclude with three things, that I think of as some fitting explanation for all this stuff:
- Kishi got high on some extreme hard stuff and actually it is Obito
- This is just Genjutsu to freak out Kakashi, Guy and Naruto to get advantage in the fight. And also to give all the crazy OBITO THEORY-FANS ony week of "I told you so" until they get crushed with next weeks chapter
- There is some sort of Madara- or Izuna- or Whatever- Part in Obitos Body. I know that Madara is dead. . . But so is Orochimara in some way but still there have been some parts in Kabuto and so on. . .And Kabuto said Madaras Edo Tensei was some special thing (Maybe he refered to the Hashirama Face but it was revealed that Madara hat this DNA already before his Death).
So i guess that the most logical explanation was that when Madara died he entrusted someone with his will, maybe with some part of his mind. And this part took over controll of Tobi. By the way. Madara died after Nagato was born. This can be since the first thing he says when he is summond are: "So it finally happened...Seems like that Nagato brat has really grown". So i guess Madara was somehow dying from whatever. And he hopped that Nagato, entrusted with the sharingan, would grow to get so strong with his Revival Abillity that he would bring HIM back one day. After Nagato died and saved all Konoha people he killed with this Revival jutsu, Tobi is really enraged and says something like "damn you Nagato, this was meant for me". So this also speaks for some Madara in Tobi.
So I guess the Tobi we know is some Zetsu-Modifikation of what remained of Obito's Body (Maybe still left with some surpressed Obito mind) with part of Madaras soul in him.
Feel free to respond if you agree of disagree or have some additional arguments. If i have time to read it and respond i would love to go on with the discussion.