If you were to have naruto use a kunai instead of his fists, and have him trained to be slippery and fast, rather than packing a punch, fighting naruto would just not be worth it most of the time. Whenever a fight breaks out he can pull out the amount he did vs mizuki if he needs to, with that many speed focused clones with pointy metal objects, i feel like most chuunin would be fighting a losing battle. Hell some jonin would be hard pressed, like kurenai, unless she can put hundreds of clones into a genjutsu. Someone like Gai would absolutely win, but hed get a nasty cut or two from the sheer number of little stab happy gremlins.
If anyone knows of anything like this, where he just stabs and dodges and overwhelms with numbers let me know