As promised, here’s the repost of the comments provided by Tobi Fan. Not my own stuff, but very good evidence linking Tobi and Obito Uchiha. There original can be found here. I think I’ll cover the Kakashi Gaiden chapters in the manga section soon, they’ll give everybody a better idea of who Tobi was and his connection to Kakashi. Kakashi Gaiden covers manga chapters 239-244, just before Naruto part II starts.
Fact #1: Tobi’s mask has one eyhole, and it just so happens to be in the same …