If Senju Chakra/Power + Uchiha Chakra/Power = Awaken Rinnegan I think that Naruto SHOULD be able to awaken it as Uzumaki are long blood distant relatives to the Senju and there was a Naruto Shippuden episode where Itachi gave Naruto power, if that wont work maybe Sasuke could give Naruto power (Maybe). Meaning Naruto has both Senju and Uchiha Power/Chakra in him. In other words: Awaken the Rinnegan like Nagato did. This is my opinion, feel free to agree or disagree with me.