Well, if you remember correctly, Smoker has a sea stone sword, however, it doesnt look much like a sword. I think Zolo could have one as sorta a back-up weapon, just not as one of his normal 3 swords. I know his goal is to meat Mihawk, and Mihawk isnt a DF user, however, he may come across other DF users
that he must have something other than his normal swords to defeat.