1 extra roaring thunder bagua made unprepare Luffy nearly dead or even dead for a short of time.
Outside of his Luffy fights attacks didn't made Kaido K.O or even nearly K.O. And this is Kaido stage in 1043 after he defeated Luffy from distraction.
You are ignoring that Hybrid Kaido's def > pre awakening Luffy's def that make you can't compare attack that Kaido receive with attack that Luffy recieve.
You are ignoring that Kaido have his ledendary Zoan devil fruit, he have his healing ability too.
Especially if he already awake his devil fruit. His healing factor will be greater. And I expected this from former strongest creature in the world.