Does Kaido remember Oden cause he doesn't wanna get Stabbed or cause of Legacy?
Anyway... ODEN was the only one to ever wound him to that point.
Oda will keep having Kaido remember oden and not make the same mistakes again
This is why I don't think Kaido uses dragon form against Yonko or admirals that much, I bet he usually start the battle with them in base mode... In dragon form, he can't defend properly.
Now I wanna see how he would counter after this scabbard attempt