Yeah, but Nami and Robin allowed strangers to look at them despite hearing open bath and Sanji we all know he won't do anything, but just peek. Your argument is he will go far, but reality he won't do that given it goes against his code.
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I can see him maybe getting a shine, but can't see it being reason Kaido best cause he still got long fight with Luffy overall, so think going to be a lot of zig zag around in the fights if they are trying to keep them separated which be hard to do. Not saying he won't be involve, but can't see Zoro being alone with him without it being hype tool him getting defeated for Luffy vs Kaido or at least stall Big Mom if he can with Killer or something.