Devil_Hex
Yay, finally caught up! Anyway, I noticed something that I probably haven't mentioned before, you tend to use "Rank (letter)" instead of "(letter) Rank", not a big deal in any way, but it does sound a bit weird to say "Rank C" for example instead of "C Rank". I guess it's mostly down to what you are used to, but usually people say a letter/number before a grade/rank.
I disagree about the MC not being talented. He has already shown himself superior to the original characters in Classic Naruto (when they were children). Becoming a kage level at a young age with this growth rate is real, there's no way to evolve quickly without a decent talent even if you train a lot.