Board Thread:Boruto Discussions/@comment-28939725-20161229141529/@comment-1872728-20170102102557

To me, Momo didn't get his Rinnegan naturally, or else he would've had it in his eye sockets instead of the Byakugan. If that's the case, then both him and Kin would be the same as Hamura, born without the Rinnegan.

Which also means, Kinshiki would've had a hagoromo-like sibling, naturally born with the Rinnegan, if he had a sibling that is. This could explain where the 2 Rinnegans on Momo's palms came from.