Board Thread:Versus Debates/@comment-29965012-20170112023147/@comment-25643824-20170125025018

@Supertinu other than the SOSP name one other person who was not a uchia that awakened the rinnegan, it is and evolution of the sharingan achieved when a uchia, not just any uchia but (Indra incarnate) grafts senju cells into themselves thereby recreating the SOSP. Theoretically Naruto (ashura incarnate) is the only other person that could awaken the rinnegan by having sasuke's eyes implanted into himself.

And the chakra drain the rinnegan places on a non uchia must be significant considering how much the sharingan does on a non uchia. But that's not even the issue, the fact of the matter is it is significantly easier for a uchia to master the rinnegan than a non uchia.