Kaido will be turned to stone, mirroring Atlas asking Perseus to do the same to end the burden of carrying the skies. Atlas was one of the titans that faced off against Zeus, which Luffy sort of mirrors when he wields the lightning bolt, as well as having a God fruit. Kaido's burden in this case being life itself and so he dies without truly dying; he is immortalized as a titan of his generation thus achieving his dream of a glorious death in some way, but is also left as an example to those that come after of what tyranny leads to, no matter how powerful you may have been.