Funny how that works in your imagination...
Kaido took an Asura attack in Zoro's last effort, nearly collapsing state due to effects of Hakai that broke his body.
That same Asura attack didnt have aCoC or KOH haki state applied.
Meanwhile, King, who is tougher than Kaido, was cut into pieces by an attack superior to Asura that Kaido tanked.
Due to both aCoC and KOH applied as well as Zoro's body not being in the same bad state he was after Hakai.
Dragon Damnation literally kills Kaido because it can cut up someone even tougher, on top of going through large magma dragon and a Hardening clad sword. It is the most brutal attack in the history of One Piece, nothing comes even close to DD.