Ok, I have come to the conclusion the only person who could be behind Tobi's mask Is Obito. The "!!!" When kakashi heard what Tobi said brought back the old theory. He clearly called out kakashi by his first and last name... Kakashi was surprised about his attention to him and the fact he said "Good Eye" Im assuming..
Tobi kept saying he wasn't complete. The fact that tobi had one eye and kakashi had another both having the only dimensional abilities in the manga, in order to be complete he needs his eye back, im sure its for some kind of dimensional ability he cannot do without his other eye... The random side story early in the manga is proof.. Why bother telling us the story of Obito and the reason kakashi has sharinan unless it was going to play a pivotal role later in the story. From the moment they told the story of kakashi's eye and obito's sacrifice I had a gut feeling Tobi was not madara but infact Obito. I may have even made such claims before, now im confident enough to say it without any doubt.
