Kudos just for the Judas Priest nod. I also thought that Judas Rising may provide insight into King's character, and that he joined Kaido's ranks with the hope of killing and usurping him. It would tie in to the theme of loyalty that permeates Wano, and contrast him to Zoro, a character with a very Samurai-esque loyalty, who'd lay down his life for Luffy.