Other than his first Rengoku Oni Giri, Zoro has only attacked Kaido to rescue Luffy. It's plausible that Zoro has been playing defensive and never launched a proper attack since then:
Well, we should wait and see. It's really bad to be arguing from headcanon of an off paneled fight. Things may become clear after we return to the Rooftop for real.
- He needed to protect Luffy while he recovered his haki
- After Luffy recovered he's been continuing to support him.
Well, we should wait and see. It's really bad to be arguing from headcanon of an off paneled fight. Things may become clear after we return to the Rooftop for real.
Zoro warns him that they should think of another way