tobi may not be madara or his brother but i strongly believe he has to be an uchiha and the reason i say this is based on the clothing he wears before the start of the war. i kept looking around through other chapters and this appears to be the only chapter that shows his back clearly with out any visual obstructions(ex. the big ass fan he carries, or any other object for that matter) and reveals the uchiha crest on his clothing. this really makes me wonder who did madara possibly put under a genjustu to carry out the task he wanted to accomplish. i can not see anyone having all this power and wanting to bring someone back simply to continue to have to be bossed around. kabuto did not bring oro. back so why would tobi bring madara back of his own free will unless he is under a genjustu simular to wut itachi is under now as he and sasuke face off against tobi.
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