I respect your thinking but I disagree with you.
Naruto received RSM at the same time as sasuke received the rinnegan.so that means if sasuke hadn't master his rinnegan in that short time then how can you assume that naruto had mastered his RSM?
Actually naruto has more room to grow.he have all bijuus chakra in him which gives him all kkgs all elements and vast amount of chakra.
Naruto can learn TSB manipulation with mastery over Nonuboku sword (world's most OP thing).
Whereas sasuke can only learn all paths and all elements.
If naruto with half kyuubi can defeat sasuke with all bijuus then how can sasuke without bijuus become more powerful than naruto with full kyuubi ?
I assume Naruto has nearly mastered TSB manipulation because of what he has shown and simply because there seems to be less to it (less complicated) in comparison to diversity of the rinnegan and its accompanying techniques. Naruto was able to use the TSB shape transformation to create different things and shapes but I never meant that Naruto had completely mastered it, I just meant there was less things for him to learn in regard to his Rikudou enhancements. Juubito used the Nonuboku sword after only recently entering Juubi jin state so that argument is invalid.
-Naruto has only a small portion of chakra from each bijuu not their full power
-Naruto has only three KKG chakra natures from the bijuu not all of them, I agree he has vast chakra compared to Sasuke but his vast chakra isn't sourced from the other 8 bijuu
-You are right I forgot about Naruto still only having 1/2 of Kurama, that may level it out considering Naruto will have quite a distinct advantage in sheer amounts of chakra but that alone doesn't convince me. Especially if Sasuke can learn to both drain chakra and use ninjutsu at the same time.