(1 Rinnegan is a KG because the only person we know of besides the SOSP to have one was Nagato, and he was a Uzumaki.
so by that logic, Naruto's whiskers are a KG too...because the only person we know of to have this is Naruto, and he is an Uzumaki...
what kind of logic is that?
there is no implication whatsoever that 1.) the SOT6P was an Uzumaki and 2.) that the Rinnegan is a Kekki Genkai
Actually the fact that only 2 persons in all of history had the Rinnegan it makes it VERY unlikely to be a KG... It is far more likely to be a genetic Mutation as Kakashi implied