Uchilia Madara, i will presume that he is not tobi..... reasons that will bring me to this conclusion is that 364 only shows one sharigan in his eyes... and when he quote the power of uchilia madara doesn't bring to the account that he is him.... if that was tru then he would of join the A-group soon as they started because if Madara was alive he would’ve been pretty old, since the nine tails knew of him.... only way for the nine tails to have knowledge of him is when the nine tails didn't have a host... naruto - ninetails = a span of over 15 years ago when the nine tails didn't have a host...... and who knew when they first met? but reasons say that they met when the nine-tails roam the world...I still say it is a more high possibility tobi is obito because they assume that obito had died when kakashi and rin fled the scene... but tobi was alive in the enemies hideout when they left... usually hunter nins would've look for his body so that the secret of Sharingan and its ability wouldn't fall in to the wrong hands. But there is no grave? so tobi could be obito....it's more relevant then tobi being Madara....