You're right, there's absolutely no evidence to support that theory, and plenty to destroy it. Kabuto was Sasori's underling for quite a while, then he was Oro's underling. If he's serving these guys, there's no way he's as powerful as they are. He would at least have to be Deidara's level, and he just hasn't shown it. I'm 99% sure he's not Tobi.Originally Posted by elmojo
The Tobi = Obito theory is interesting, and goes back to what Itachi said to Sasuke after he killed his parents. Obito could be one of the 3 magenkyou users if he's still alive, and remember, they never found a body...