The issue is not Zoro cutting through Blazing Bagua. Zoro can injure Kaido just fine, even before Adv CoC. Zoro can not fight at Luffy's or Kaido's pace. King was knocking him around with brute strength. Kaido is several times stronger in basically every area.
Zoro won't be able to block such attacks for long. He doesn't have special Durability against blunt force like Nika and his stamina+Endurance is nowhere near Kaido's.