BM Naruto is easily above Nagato
Even KCM Naruto would beat NAgato in a fight.
the argument that nagato beast naruto just because Naruto uses a giant chakra cloak is hillarious. Naruto is tiers beyond tiers faster than nagato, nagato has to actually grab naruto's cloak to absorb it, and he'll never ever be able to do so.
Sure Nagato's preta path negates Naruto's big guns, but that in no way means Nagato is immune to naruto's attacks. A flash shunshin punch to the face or kunai to the throat ends nagato, he was barely able to react to Bee's V2 lariat. SM frog katas kill Nagato, and nagato turns into stone if he absorbs a SM clone that entered SM on its own.
On the offensive side, nagato has nothing in his arsenal that can even hurt BM Naruto. In just KCM he took zero damage from nagato's shinra tensei. CST can be reflected by the Kyuubi avatar like KN6 did to deva, or it can be flat out tanked considering he blocked the Juubi's multi-mountainrange busting laserdama. CT is easily busted by machinegun dama or waves of FRS, Naruto doesn't even have to use his super bijuudama to do it. Summons are easily dealt with, he sent 5 bijuu flying with just a roar his KCM clones can spam FRS which end anything bar cerebrus, and he can easily crush them with chakra tails. and yeah, asura path is not hurting or hitting BM Naruto.