Originally Posted by Reesaroni
I don't see it being telepathy since Kakashi doesn't have the plant I think it's just gonna be something else retarded about the sharingan.
As for him using it, it's gotta be either the chakra thing or somehow he didn't know about it which seems absurd to say the least.
Obito already saw through his SG in kakashi as if they were still connected... Now his eye even in kakashi became Mangekyou as if still connected to obito still... And since zetsu said zetsu (hashirama plant bodies with use of his powers), can use telepathy... That means that obito should be able to as well...
Also, I think obito already has some relation to the younger brother of the sage either through the sunju or uzumaki... How else is it he is able to use hashirama's mokuton so naturally... and notice it was only him with the half body of zetsu/hashirama that was using the mokuton, not even the tobi zetsu body suit... which is why only the right side of his body used the mokuton... it was all him...