There is no valid reason to actually Nerf the kit on Naruto. This is only a problem because of how everyone stacks bp on pos 1. In truth Naruto[Sage of Six Path] has a low damage mystery same with all his counter parts. The only difference is that unlike Naruto[Sage of Six Path] all the other Naruto s have added repulse damage which is basically broken. His leech is purely dependent on the damage of his attacks and I've already said that it's actually on the low side. In theory Naruto[Sage of Six Path] should only be healing about 20% of his hp if he hits 9 ninjas with comparable bp, but we are in this hole where pos 1 are doing 4x the amount of damage because of stacking so you see Naruto healing to full every round.

So my argument is that Naruto kit is not broken its perfectly balanced just that bp is literally overriding his low damage factor and it only seems like he is over powered. I'm pretty sure those near the limit of bp which is 500k or something will also see the low damage but anyone below this point will think Naruto[Sage of Six Path] is broken.

I would also like to point out that you can stack Lee[Gate of Joy] to literally one shot these Naruto[Sage of Six Path] but no one does anything fun like that.