As we all know Tobi and Kakahi's eyes are linked FOR SURE.
We are now wondering how Tobi's migration tec. works.
Don't worry I'll get to the point about the mask
My theory is you know how Tobi stated that Kamui wont work on him.
When Tobi migrates it looks like this
And when Kakashi warps things away looks like this
They both have the same spiral looking warp, right?
Now on to why Tobi wears the mask, its because he cant use his migration tec. without it.
But how is that???? Its because his migration tec. is just Kamui that he uses on the mask.
Asking how would that send him to that universe, remember its stated that what ever he touches is warped to that world
his mask is touching him
so all he does is warp the mask and Tobi goes along with it :D
tell me what you think