Board Thread:Versus Debates/@comment-24670663-20150831190034/@comment-3965545-20150901004034

He awakened it in himself, his/Ashura's chakra awakened it with the help of the temp chakra gift. If someone needed the specific gifted chakra alone then Kakashi would have never kept the transplanted Sharingan since he does not possess Obito's chakra, it would have turned into a normal eye.. and Nagato would never have had Rinnegan since he did not possess Madara's chakra, the eyes would have turned into normal eyes.