ok... but if its possible, then madara would be weaker...No the reason why I said Madara maybe able to do it is because he is in edo mode
Nagato and the SO6P couldn't of done it because they were, how to explain what I mean clearer
Madara might of had Nagato receive the Rinnegan so one day he could be bought back to life because he himself couldn't bring himself back to life because his dead.
However Madara is still dead now but his conscious now, so his able to perform the technique because his in edo mode
I don't know how if that made any sense, ah I know what I mean xd
Also that Nagato couldn't do it because Kabuto had control of him all that time, now Kabuto is gone and Madara is free to do whatever he wants because I believe that because Muu summoned him, that Madara won't disappear
he couldnt regenerate himself, and would have limited chakra... so he would lose against the kages...