I really don't see how obito can be beaten maybe if if he was fighting against madara and hashirama combine then I might say obito would go down. So that lead me to be believe sasuke would eventually gain the reningan and Naruto also would have to go up (please more jutsu not another rasengan) another level but then I asked myself how could that be done if he doesn't have hashirama DNA. Then the last white zetsu from the six zetsus, juugo expelled from sasuke. Orochimaru took one, the 4 kage spirits took 4 and one was absorbed by juugo not destroyed would injected into sasuke just like when juugo injected him when he was injured from the 8 tails battle. It probably would be some sage/ senju DNA combined. And for Naruto we all have an idea what going to happen, a few more ppl r going to die ( bee), so Naruto can be complete his transformation and together with Minato yin kyuubi chakra to reach his final.