Originally Posted by jericho Uzimaki
The sage modes are different from Naruto's thy are based a "different " system, you will see.
Kakashi as well as a few others now sport Uzumaki seals given to them by either Naruto or higher ups of the now stronger Uzumaki Clan that resides is Konoha city. They give him enough chakra to not have to worry about his levels during combat EVEN using the RG.
This generation of ninja are very powerful, but they are very gifted and have advantage over the other teams in Konoha city.
And that concept is fuckn killer but for whatever reason you never spelled it out that way in the story, the Uzu seal explanation, etc. That makes the Kakashi the badass he was meant to be. When can we expect your next installment? That explanation makes it even more worth the read.