He is not the real Obito! Oh and.... I told ya so!
As I tried to explain it to you in a prediction I made 7 days ago
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He is still Madara, who has taken over Obito's body because his own was too heavily wounded thanks to Shodai. After all the soul splitting we have seen in this anime, Shiki Fuujin, Rinnegan soul exctracting Jutsus, do you really think Uchiha Madara who had unlocked his Rinnegan would let himself die so easily? He obviously split a part of his soul with the Rinnegan, poured it into Obito's dead body and reconstructed him with Zetsu's cells.
Now this is the second time in a row I have been right about Tobi, the first was when no one believed me, after all the effort I put into it, that Tobi had MS.
Go through my threads if you dont believe me....and now stop confusing yourselves by overthinking so much, Obito has been dead for a long time. Madara/Tobi needed an Uchiha body for his plans, and as he told Kakashi, he got that body and that eye after the battle of Kannabi bridge.
Whether you want to believe me or not is up to you, but I am pretty sure that next week Ill be making another "i told ya so" thread after Madara explains it.