Tobirama either ties with Gojo or wins by slicing Naruto with Suidanha. Naruto wins S2.
I think it's obvious by now that piercing attacks don't get the same rules applied to them compared to non-piercing ones, even if they are massively stronger and there are too many examples that support it:
- JJ Madara being casually stabbed by a sword, bisected by a regular Chidori spear, yet he tanked Air Canon blows and it took Night Guy to visibly damage his body.
- Kaguya tanked
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yet got her arm severed and later Kakashi made a slice with his Raikiri.
- KCM Naruto survived Tenpenchii at the cost of his mode, yet RBSM Naruto failed to tank a sword that didn't even have much momentum.
A rusty Naruto.
We've seen KCM Naruto tank sword blows
1. Him being rusty has nothing to do with the defensive capability of his RBSM, which should be tiers above KCM anyway, not to mention that he had 100% Kurama at that time. The ''rusty'' comment was referring to Naruto's inability to react to the attack and being too phased by it, a.k.a that he had lost some of his battle senses.
2. KCM Naruto
stopped swords with his hands - that's completely different from taking a blow directly.