When Luffy and Kaido AdCoC no touch, there's literally no difference if you put Kaido's Club in Luffy's hand and have Kaido bare fist, nothing changes
I have no idea why you'd think that lmao. There's absolutely zero hints, much less evidence, that ACoC somehow means your skills and weapons no longer matter toward the output.
Their weapons/bodies are STILL the conduit of the attack. Their skills with it, the quality of the weapon/body, strength, speed etc, etc, still matter. Immensely so. For the output of the attack.