Board Thread:Versus Debates/@comment-33229263-20171019104931/@comment-734582-20171019184650

It's not so much that Hagoromo's chakra is needed. Rather, recreating Hagoromo's original power includes recreation of the Rinnegan. Hence, by recombining Ashura's and Indra's power Hagoromo's power is recreated, which includes the Rinnegan. Note that this is similar to the Ten Tails recreation. If we add Kurama to the mix, we recreate Juubi Jinchuriki Hagoromo's chakra and he can be brought out as a spirit. Tasuxeda wrote: Hagoromo was likely missing some of the genes that were responsible for his mothers Rinne-Sharingan it is unlikely the Rinne-Sharingan is the result of a single gene but is more likely to be the result of multiple genes working together to produce the Rinne-Sharingan. Yea. The idea of the Kekkei Tota/ Kekkei Mora sort-of implies that more complex genetic codes allow for more complex powers. And as more complicated sequences of DNA are recreated in a person, greater powers surface.

In Kaguya's case, it's clear that the Byakugan and Rinne/Sharingan lines are mutually exclusive. Hence why the Rinnesharingan is in her forehead.

In Madara's case, his Rinnegan were already in his normal sockets, and those are implied to be mutations, so the only way to have a proper Rinnesharingan is in his forehead.

In Sasuke's case, Hagoromo did some trick to manifest these powers differently.

Either way, it's clear that the Rinnesharingan is the most complex genetic power to date, since it was split in to distinct genetic sequences (Rinnegan and sharingan) but beyond that the power to make them coexist and be one eye was lost.

So the Rinne Sharingan can be thought to consist of some 4-5 separate Kekkei Genkai: (Mangekyou) sharingan, Rinnegan, Simultaneous manifestation and Unification. Note that Sasuke has the ability to manifest both at the same time (unlike Madara) yet doesn't have them as a complete new eye.