The sage created all ninjutsu, did he? What about edo tensei, I thought Tobirama created it? He was the founder, not creator. The elder son didn't have the rinnegan he had a different dojutsu, look it up again. I personally don't think you need senju DNA, some people do however, and you can't rule it out as we know there are specific conditions, there are just specific conditions, we know that much.
I am not saying it is impossible that Sasuke gets rinnegan, it's just Naruto will have to get a powerup to match up, something to do with the juubi chakra, they have to be equal, Naruto has had enough powerups for me so I think the perfect susano'o will be what matches them up.