Aside from the confirmed ones
Mihawk: 100%
Blackbeard: 90%, he doesn't really need it but since he's one of the final and most important villians for Luffy it would be weird if he doesn't have COC.
Law: 20%, he has like 4 arcs in which he acts almost like a deuteragonist of the stories but there's literally no hint of him even having it so I doubt he is gonna unlock it later. Even Kid has that one throwaway line from Kaido. Although it makes sense for him to have it tho.
Croc: 20%, same reasons as Law.
Weevil: 40%, he's the one who hasn't been focused on yet so there's still possibility that Oda is gonna showcase it later
Kuma: 0%
Jinbei: 0%
Buggy: 50%, Oda likes Buggy. Although there could be a workaround that people mistaken Mihawk's COC for Buggy's which is in line with Buggy's previous gags.