With proper practice and age, Naruto can get SM to that level. Especially since he can merge with Ma and Pa now.
Nagato?
Sasuke?
Obito?
Stop wanking, these three rape SM Naruto no matter how long he trains with it.
Can't break Susanoo. (FRS is efforlessly tanked)
Can't dodge Amaterasu. (Not as fast as A, who Naruto needed KCM to dodge)
Can't dodge or block Kirin. (Not even KCM can do this)
He gets shitted on. Sasuke low diff.
Frog Kata solos? Are you trolling? Obito ALWAYS goes intangible when opponents charge at him, regardless of knowledge or not. Frog Kata isn't even going to hit him period. Even if it does, its nowhere near enough to one shot him, and once he has knowledge on it, he won't fall for the same thing again. This guy gets dodged and warped. Rinnegan and its abilities aren't even needed. Obito low diff.
Bansho Tennin+Soul Rip= Dead SM Naruto. Nagato, low diff.
SM Kabuto rapes SM Naruto, Hakugeki+Chakra scalpel, GG Naruto.