Board Thread:Theories and Speculation/@comment-25043344-20150712073834/@comment-4646462-20150905163308

Definitely the consistency. The whole thing is ridden with so many contradictions, retcons, and what-not that if it were rewritten from the ground up using current knowledge, it wouldn't even be the same story.

As for power-ups and evolutions, well, due to limited circumstances and poor writing we've never seen the full extent of Naruto's and Sasuke's powers. At the least, the Boruto Movie has Kurama encased with what looks like Sasuke's 9-tailed-beast-enhanced Susanoo.

Sasuke already has a degree of mastery over his Rinnegan's space-time aspects, and probably has mastery over the six-paths' techniques by now. As for a chakra mode, it may be plausible to form the Perfect Susanoo as a suit of armor rather than a mega-aura. He may also be able to reform his chidori and amaterasu into different shapes depending on the situation, such as blades and arrows (as he's done) or even shuriken (similar to what Kakashi did, in the shape of his EMS). What's also possible from him and Naruto is Amaterasu-enhanced Bijuu-dama. That would be the in-universe equivalent of a megaton napalm bomb. Relevant is his possible ability to perform Tenpachii, and perhaps do so in a more controlled and potent manner (like Kirin), rather than just showering the entire region like the Juubi does.

Naruto's only been using what has been proven time and time again for him: Rasengan/shuriken and shadow clones. It may be possible for him to branch out and use newer techniques with his complete nature transformation abilities. If need be, Naruto can call upon all the tailed beasts to lend him chakra, letting him form his complete SPSM again. Also, with such chakra, he may be capable of forming a complete Asura Mode aura (IMO Asura's aura should have been 10-tailed, not 9-tailed, unless there's a connection with Kurama that we haven't been told about). He may also experiment with different Rasengan formations, like he did whilst training in his Kyuubi Chakra Mode, and someday may perfect Sage mode to the point where the only visible change is in eye color (like Hashirama's Sage Mode, but without the markings). He may also enhance the Bijuu-dama to be more dark-chakra saturated whilst still maintaining stability, similar to the anime version of the Juubi's attack.