If theoretically, Kabuto calls off the edo-tensei... Could Half-Muu be revived again? That's my point.
The only other possibility for Tobi would be Izuna, or something that's not human... Izuna couldn't live to be that old though, considering he was dying of disease, and there was no mention of him having his eyes back, and he died. As for being a non-human creation of Zetsu's, why would a zetsu clone be aging? I have been pretty good on my predictions, and under the current circumstances, there's only one true human match for Tobi... There's always that possibility that he's non human, but why would he want to bring back Madara if he was some imposter?
Originally Posted by krurk
I understand the fact that anything is possible to to change, look at Tobi/Madara, while there are interesting points, its likely that Madara did live through the battle with Harashima and lived up until the time of Nagato. It is within reason that he thought Nagato had his body and used the revive jutsu to bring him back to life, and its very possible he knows who Tobi is. The only question is did he sanction Tobi to use his identity, and if not will he be the one to talk Sasuke down and tell him not to become a trader.
I'm believing that Harashima left the battle, seeing a dead (half) Madara. How does Tobi know so much about Madara if he isn't really Madara? Even Itachi believes Tobi to be Madara, and this was before the spread of that news. It's always possible that Madara made it out alive, but if he made it out alive, what killed him, and why was he believing that Nagato used Rinne-Tensei on him, as if it was all a part of his plan?