Why are people sleeping on Hotei, The mirawarigumi leader? He's a samurai and should be a high tier one.
For me personally I'd like it if Zoro faces a swordsman in a pure swordsmanship fight.
King, Queen and Smoothie would great fights for Zoro, but I'd take a pure swordsman over them to face Zoro any time of the day.
I think Mihawk and Ryuma are his only pure swordsman fights in the series and they weren't that great either as Mihawk stomped him and Ryuma was too weak to be a true challenge. Zoro wants to be WSS so he should face more of these types of foes especially in the land of the samurai, Wano. If not I'd be really disappointed.
I had hopes for Kyoshiro when he was first introduced but we know how that turned out. Now the only pure swordsman left who might be a challenge for Zoro is Hotei. Eventhough it's a long shot I'm hoping he's a hight tier swordsman that can push Zoro to 100%.