You are comparing apples to oranges.
This is the 3rd time luffy fighting kaido.
Zoro fighting Kaido the first time and giving him a scar is better than Luffy getting KO 1 shot by thunder bagua the first time.
This is the 3rd time luffy fighting kaido.
Zoro fighting Kaido the first time and giving him a scar is better than Luffy getting KO 1 shot by thunder bagua the first time.
Thunder Bagua is still the strongest attack seen until now from Kaido, and is a speed burst attack as well.
Nothing comparable to trying to hit casually with a normal club hit against Zoro where he didn't take him seriously at all (didn't try to dodge, neither used the Thunder Bagua from the start and neither is using his top speed since Luffy without gears could battle him and we later will see how he will fight Luffy with Gears in speed as well).