Board Thread:Theories and Speculation/@comment-734582-20150720112958/@comment-734582-20150721113251

GreatestSin wrote: did the soul change kakashi physically? because if not, than kakashis eyes cant become the sharingan (if we take you own theory and say that "brain and eyes need to be special") ^_^ Yes the soul changed Kakashi physically, yet only temporarily. Just like a Soul summoned by Edo Tensei does to the Tensei sacrifice.The only difference is that Obito limited his influence to the eyes only. Just like Edo Tensei, once the possession is broken the abilities fade.

I've said this before: Obito's little feat works EXACTLY like Edo Tensei. It's not a plothole because if it is, so is Edo tensei.