Board Thread:Theories and Speculation/@comment-34661853-20181111160651/@comment-34661853-20181115204555

Soloking itachi15 wrote: Wait if Hagomoro gave all of his chakra to Asura, back when Asura was consider to be the successor of Hagomoro then how come Asura didn't awaken the rinnegan ? He had Hagomoro's chakra yet he could only use six path sage mode. Plus if Hagomoro purposely gave Naruto the spsm and sasuke rinnegan because he didn't want another war between his kids, Asura was given hagomoro's full Chakra and his abilities, it was never shown that hagomoro gave Asura selected abilities like Naruto but still Asura didn't awaken the rinnegan.

Not including otsutsuki, at least for Asura Indra transmigrants a sharingan is a necessity. Maybe otsutsuki don't need a sharingan but for Asura Indra transmigrants they do need a sharingan to evolve into rinnegan.

Exactly. And I think it works only for transmigrants.