You can call me crazy when I say that; the way how Tobi grabbed his right arm strongly like that, is IMO because
he truelly loved his brother and he's still agry about the fact that his brother sacrifice was for nothing. That was the cherry on top off everything what made him already angry. His own clansmen choosing the enemy as their leader + his brothers sacrifice, boiled up his hatred further.. ( the thing that makes the Uchiha stronger is Pure Hatred ). IF he isn't Madara, then way showing this emotions? The reason why he manipulted so easily, was because he knew that telling the truth about his brother, would made him angrier then ever, and that was he needed.
B: OR Itachi really found him the woods all by himself, what made him to be more caution about Itachi. Also the reason why Tobi couldn't do any shit while Itachi was alive, is more proof that he couldn't fool him at ALL. Tobi even said that; even in death, he never ceases to amaze me. Itachi and Nagato were the only two people who knew who he was. ( I belive that Zetzu knows him from the start, but lots of people don't belive that ). The reason why Nagato knew who he was, because Madara needed brute force in his clan and probably the Rinnegan, and the fact why Itachi got to know him, is what I've explained in point A and B. Itachi was a high level shinobi that he couldn't play with, especially not his mind. Itachi's intelligence and overall skills made him to be an obstacle for Madara and Itachi's illness was the reason why Madara got to go further with his plan.
Secondly.. the beauty for tobi being Madara, is because Madara is the CORE of Hatred, the genius of all the uchiha's from the beginning. The hatred that the current generations are living with, started to envolve the moment when nobody stood behind Madara Uchiha. Madara and Hashirama are both te instigator of the shinobi world.
Recently we heared about the two sons, elder and younger,.. but in the beginning of the manga, Madara and Hashirama were the ones who brought Peace and hatred.
It wouldn't make any sense if it wasn't the real evil M..fcker who wanted to mess up the shinobi world 65 years ago. The beauty for Tobi being Madara, is what makes him to be the most epic villain in the end. So far, beside of Oro, we didn't have a villain thats PURE EVIL, PURE HATRED and a villain that had / has huge influences on the shinobi world for so many years. Someone who started the circle of hatred ( not counting elder son ) and that someone being alive, who corrupted the world and innocent people, has to be stopped by a pure hearted shinobi after 65 years.
- Izuna, well.. my first thought was that it could be his little brother. But then again; why would he be afraid of his little brother? make no sense.. so If I have to think like you do, that means that the current Tobi isn't Madara at all. And the reason he got shocked like that, was because Kabuto summoned the REAL MADARA and when people would know that, then the POWER OF TOBI what everybody is afraid off, would be gone, perish. His authority would be fcked.
- Tobi is Izuna, Madara's little brother and the reason why he got shocked like that, was because Kabuto summoned the real Madara. Again; I first thought was that it has to be Izuna, but then I read in DB 3 that Izuna died in battle and it has never been stated that Madara is dead, only that his body hasn't been FOUND. But still: a big change that it could be Izuna and that he's playing in the name of his brother out of respect.
- IN onemanga.com translations, Madara said: You bastard,.. WHERE DID you get that? what does he mean with this? Where did you get my original body ( speaking like he's madara himself ) or in Izuna's case; where did you get my brothers body... Kabuto said: It's complicated ( Kabuto mastered Edo Tensei better then the previous users, meaning that he could probably summon a soul from a death god and maybe even the original body instead of using sacrificial bodies. )
okey, for finishing this up:
I would hate the fact that tobi wouldn't be Madara. I answered above why I would think that,.. and if Tobi isn't Madara at all, then the only peron that I would appreciate would be Izuna, his little brother.
I will correct myself for saying that it's the original body of madara inside that coffin, but if Tobi isn't Madara or Izuna, then I would be very dissappointed.