Kaido's durability made all attacks useless except one - Zoro's Asura. That's the only thing that left a mark.
Kaido was on shaky legs exactly from Asura hit itself.
Yamato never called Luffy on shaky legs, that's your headcanon based on wrong translation.
Inexperience drawing more stamina is another headcanon of yours, Wessy-chan.
I dont think Luffy is more fresh than the guy who has been fighting non-stop, I know he is more fresh.
All your excuses are useless and you have another L coming towards your boy. Are you ready?