Board Thread:Naruto Discussions/@comment-24120130-20140607191120/@comment-24531362-20140701134540

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.