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^^ I didn't explain it better so let me try this time. Please read this entire theory.
Also only read this if you are a believer to Sir Derps Theory of SO6P Being a Uzumaki.
I believe the SO6P Did not have the Sharingan/Rinnegan/or any Ocular powers before he stood face to face with the Ten-Tails. I do believe he was a Uzumaki. He fought the Ten-Tails and won. Once the ten-tails was sealed inside of him he obtained the Rinnegan as representation to him sealing the ten-tails and being the Jinchurki.
When SO6P created or gave birth to the Elder/Younger son he SPLIT the rinnegan into Sharingan and Senju. Which is why WITHOUT the ten-tails is the only way to obtain the Rinnegan.
Naruto already has most the 9 tailed beast Chakra inside of him. I think that Naruto will get the rest of the tailed beast chakra inside of him he will obtain the Rinnegan just like the Sage did, BUT I also believe after the war he will guide and disperse them and give them eternal peace and SINCE they leave his body the Rinnegan leaves also because Naruto obtained it in its truest form where as other people just combine the elders son eye and the youngers son DNA.
Please just think about this. Its very reasonable.