unknown, many possable thinggys, i think that tobi is madara in order to stay alive took obitos body. having that NOT a sealing jutsu Madara could come back with Edo. :/
izuna is tobi doing his brother's will. madara is dead and will be back to take part in the 4th ninja war. he and izuna will meet again and fight the 5 kage
that cannot be possible
Tobi is fighting Naruto Bee Gai and Kakashi
Mardara is fighting the 5 kages and Kabuto took Mardara from that box along with all the other dead people so there's no way that they are the same person
i think i't some kind of clone because tobi knows very much about madara's history .
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from where do you think he possess uchiha and senju and knows so many for the battle whit hashirama this is my point he is madara's clone . any other suggestions ?