Board Thread:Theories and Speculation/@comment-26422608-20150522042352/@comment-26090730-20150523192827

Sanbi221 wrote: It was so much easier before the Indra and Ashura thing came about. Why couldn't it have been just a descendent of Uchiha and Senju is the only one who can awaken the Rinnegan, or an Uchiha with Senju cells (like Madara) or vice versa. It would make things a whole lot simpler. Sighs. Anyway, Naruto would have to steal one or both of Sasuke's eyes, and transplant it into himself to work, since he can't use Sarada's because she isn't Indra's reincarnation. Besides, in order to get the EMS you have to take another Uchiha's eyes and since Sasuke's already at that stage, it would make sense to do that. whats so difficult about this?

Ashura´s chakra+Indra´s chakra+Sharingan=Rinnengan

Its not so hard.