There's a fundamental problem in the way some readers and some others approach this issue, which is their understanding of fights and power dynamics in this manga. Some will believe that opening Kaido's scar or making him a new one would be an instantaneous statement on Zoro's overall strength, meaning he can defeat any enemy who can't perform such feat; I'm not among them, because that'd only say (without taking into consideration Enma's influence, which is still unclear) that Zoro has a higher attack power than those who tried and failed (not even armament haki, necessarily), but shining in one stat alone doesn't make you stronger overall. For example, Oven is stated to have the most durable body among the Charlotte children yet he's clearly inferior to the Sweet Commanders as a whole. There's a bias involved here too, because some stats are overestimated as more significant in establishing the power of a character; attack power and size of a technique being the most common.
If Zoro's main fight in Wano ends up this team effort while Sanji takes on King or Queen alone, we will have pretty much no ground to make any comparison and any approach tried will be probably fallacious to begin with, following unfounded reasonings like the one I just explained about over generalizing stats.