No one confirmed anything. They do look alike ,but no one said he was his reincarnation. He was just good with the other tailed beasts.1. Kurama and the other tailed beasts all confirmed Naruto to next sage that the previous so6p spoke about in his prophecy to them
2. Rinnegan needs both Uchiha and Senju powers (eyes and body) to obtain. That's a manga fact. So it's not exclusive to either one of them. It it were, then that would mean that one clan could get it on their own and wouldn't need the other's help
I was just annoyed with how stupid your comment was. That's allAre u worshipping the manga ?? It's made by a Fukin human!!! Anything can happen??. Ur butthurt lol