Board Thread:Naruto Discussions/@comment-5054236-20150717003436/@comment-24808887-20150717033850

Hagoromo sons have recieved: Indra - Sage's eyes and his spiritual power(yin chakra); Asura - Sage's body and his physical power(yang chakra) - so if we mix their chakra we will get Hagoromo's Six path chakra that's known but: Sage's eyes(literally eyes of Indra and his reincarnations) will get you Rinnegan, while Sage's body(the one that good with becoming Biju host and Sage(just sage) - Asura and his reincarnations) will get you Six Paths Senjutsu(if reincarnate already knows Senjutsu) so the reason why Naruto didn't get Rinnegan is because Rikudou chakra correlated with that what he inherited from Sage - body. Funny fact that Madara(who had Asura body transplant - Hashi boob) still wasn't able to enter in to Six Paths Senjutsu while having Six Paths chakra(from Rinnegan) and Senjutsu from Hashirama.