Kaido suffered a 20 year ptsd from one ACoC attack, what are you talking about
A critical hit with adv CoC on head could be very fatal.
Oden show this against Kaido.
But also Kaido knocked out Oden with a hit in head, without adv CoC or named move..
Luffy literally used his strongest second move against Kizaru, in the head with adv CoC...
A weaker version knocked out Oden for good, yet Kizaru is still standing after receiving a far stronger attack...
And Oden was known for a endurance/durability beast.
And Oden is a top tier too...
Agenda aside, it is actually a great endurance feat of Kizaru to stand up and fight back, even if it took few minutes(we all know due plot) to stand up, it is still a good feat.
With the Garp vs Kuzan fight, everyone should understand that Admirals also have incredible physical/durability/endurance powers...