Good theory, but I don't think so. Remember... Madara is hooked up to the statue. He has to have pretty long cords to get all the way to the Mist village, plus he can't do much with his single sharingan. I am pretty sure Konohamaru could take out the old Madara with one attack -_-. Madra even stated that he cannot disconnect from the statue or he would die. I already posted a theory a couple posts below, but here is what I thought:
A long time ago people used to wonder why Tobi/Obito took control of Yagura (the Kage of the Mist and Jinchuriki) and created chaos within the Mist village. Remember when Zabuza said he wanted to assisnate the Kage of thr Mist because of the internal chaos that was going on? I believe Obito took over Yagura and created turmoil within the Mist village to get back at them for the death of Rin.
ALSO if you go the Narutopedia and look at Yagura in the background section you will see a tall figure shrouded in darkness stadning begind Yagura:
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That implies that the person had to travel to the Mist village to control Yagura. Madara can't travel far, remember... that statue? But Obito could. And Obito DID have long hair at some points in the manga. And he also activated his Mangekyo during that fight with the Mist, so I think it makes more sense.