First of all Awesome chapter.And i don't think Tobi is Obito,i do think its obito eye even if some people say his right side is crushed when the manga clearly says his right side is ALMOST crushed which means that the eye could of survived,if it was completely crushed his skull would be crushed and his brain and then he would not be chatting up Kakashi and Rin he would be dead.I don't think its Shisui cause he gave Itachi one eye and Danzou took the other but Itachi said he made it look like he destroyed his eyes and erased his existence.It certainly isn't Madara since he was brought back from being dead under Edo Tensei.So the only ones i could think of is Izuna, cause i don't think Madara would let his brother suffer for so long, probably faked Izuna's death so they can start their eye of the moon plan and Izuna would be the ace in the hole in case he died during the fight with the 1st Hokage,but Izuna would have to remain in the shadows 4 that to happen.And if its not Izuna then it must be Madara's masked apprentice who ever that is.there is no way even Itachi could know that the masked man was Madara for sure other than suspicion.Not even Karuma raised an eyebrow when Tobi told Naruto the truth about Itachi and he was a few feet away,but he felt it when Edo Madara tried to summon him.The 4th thought it was Madara but then realized that Madara must be dead to which Tobi replied i wouldn't be so sure.So perhaps at the time when the leaf was attacked by the fox Madara was still alive but he would be hella old by then and Edo Madara looks pretty young not nearly as old as Tobi looked while fighting Konan but i'm sure Kabuto has a good idea who he might .......But i'm just speculating and if any of this sounds right or wrong HOLLA.Again AWESOME chapter.Also even tho Tobi was controling 6 tailed beasts and using a sharingan and a rinangan and Guedo Mazo he does not seem to tire so he has an obscene amount of chakras.