Board Thread:Naruto Discussions/@comment-24120130-20140607191120/@comment-3568954-20140702023847

Mrlmm0605 wrote: It is totally impossible for Hagoromo to have a kekkei genkai not possessed by Kaguya. The laws of heredity, which Kishi tries really hard to abide by, deny even the possibility. Therefore, Kaguya had to have a Rinnegan. It can, though, be a subtly genetically different Rinnegan than that of Hagoromo, because of the recombination of genes. In a story context, all chakra abilities had to have originated from Kaguya, because al chakra originated from Kaguya. There is no middle ground. Either Kaguya has the Rinnegan, or there is no such thing as a Rinnegan. One of those is obviously false, so we have but one option.

No it isn't impossible you have no idea what you are talking about. and the Rinnegan and Sharingan are essentially the same thing. All Rinnegan are sharingan as well. but not all sharingan are Rinnegan. kaguya had the Sharingan and byakugan so she never focused on enhancing her sharingan. she used them both together and as such it would be redundant to have a third dojutsu hagoromo had only 1 dojutsu. and the dojutsu were inspired by a Japanese story with a clan that each member has a unique dojutsu