Board Thread:Naruto Discussions/@comment-29393962-20161111215453/@comment-734582-20170113111153

Georgio722 wrote: I meant only the transmigrant that possesses the Sharingan can awaken the Rinnegan. So even an Asura transmigrant has the ability to possess the Rinnegan, but only if this person has the Sharingan beforehand. Yea i know you meant that, but i double checked and there's nothing in the Manga that says that. Black Zetsu, the guy who observed centuries of history, tried both transmigrants to get the Rinnegan. Sasuke's eye makes it clear that Sharingan and Rinnegan are different dojutsu.

SO no, an Ashura transmigrant doesn't need Sharingan to get Rinnegan. Hagoromo's intervention ensured Naruto wouldn't get Rinnegan and that Sasuke wouldn't get SPSM (as he did have some of Juugo's flesh, so he could've figured out some sort of Sage Mode). Why would Hagoromo do that? Because combining these branches is what created trouble. by giving each half of his power and exactly that, he would force them to cooperate.