I was rewatching some of the show, and saw the part where he unveiled his left sharingan. Was this Madara's eye that he gave to Obito, or was it one from the Uchiha massacre? Those were my ideas...
So, Madara and Izuna both had MS. Well, why didn't they just give each other each others eyes so they would both get EMS? I might be missing something, but i don't think you need your eyes and another persons set of eyes for EMS.
He wants it so that everyone can live in a dream like state where they can control pretty much everything. Whats not to like about that? For Naruto, he could bring back Jiraya, his parents, and marry Sakura or whatever... Why wouldn't he wanna do that?
Obito/Kakashi has Kamui
Sasuke/Itachi has Amamteratsu and Tscukyomi
Shisui has the mind manipulation thing(I think)
Is Madaras unique ability the meteor thing?