LOl, what a really bad theory
Everything against this theory, is said by the posters, before.
And also to come up with some "arguements" from Sinaura.
It is untypical in shonen-mangas for this big twist, which would be a big plot-developement out of nothing, if he was to be revealed. The resulting consequences out of this relevation, would "blast" the concept of this shonen-manga
In shonen-mangas you normally follow a strict line with some twists here and there. There are enough mysteries until now, so no need for further (big) ones.
It would be to complex for a shonen-manga to begin with.
Danzou being Tobi? Nice try..........
But the OP can stick to his theory until the end of the manga