I wouldn't take it so serious though. The strawhats like to goof around a bit before getting serious. Zoro was clashing with Pica's real body multiple times without overpowering him. But once getting serious, chopping a mountain into pieces and oneshotting FBH Pica. Right now, Zoro isn't even using Santoryu. Keeps Enma, his strongest blade, away. Once he gets serious against someone like King, putting on his bandana and using all 3 blades, it will be another story.