Kaido relies on his zoan more than anything else. His Haki stats are just add-ons to his zoan form. The whole unkillable thing moniker comes from his zoan in the first place. Ancient zoans are more hyped than regular zoans. Again, these arguments aren't gonna change a thing unless you want to argue Kaku had better mastery of his fruit than Kaido or even Marco for that matter. King was straight up low diffing Zoro outside CoC, so Lucci doing good, which I doubt, wouldn't change a dime.