Do you speak proper English? Then its WGS:







World's Greatest Creature
Lol.
Zolo will lose to a WSM if WSM uses swordsmanship, Zolo will outskill WSM's swordsmanship and prove he is a better swordsman, then WSM will kick Zolo's ass due to Haki, and other fighting styles difference that WSM uses (martial art, or Devil fruit etc).
So, yeah, you do you.
In any case, what you're saying is true as long as WSM isn't a swordsman. If he's a non-SM who uses swordsmanship, as stated to be possible by Zoro... then yeah. If he's a canonically swordsman, then Zoro either wins or he ain't WSS.