in 380 we saw again that attacks seem to phase through tobi. also we know he has a sharingan.
these 2 facts have ignited a theory on the true identidy of Tobi!!
shisui of the mirage, interesting....
no doubt this nickname corresponded somehow to his abilities. when i
first read this i expected he was an exceptional genjutsu user that
implanted halucinations into the mind of his enemy. But now i have a
different idea:
mirages are shown with the characteristic of a ghost or something that doesnt actually inhabit the space it seems to be in.
WHAT!!! the rasengan went through him!!!
OMG!! the sword went through him too!!!
it seems to me like he only appears to be there, like a mirage!
so, i theorize tobi is shisui of the mirage