The whole point of Kaido falling into a volcano and being forgotten is that it is antithetical to how Kaido wanted a glorious death. WB died like how he died for a reason. Funny how the CP0 guy didnt even bother checking on Kaido. Anyways, falling into volcano and being forgotten was nice. However the flashback had so much potential to develop him into a complex character. From what we got, he just seems like a warmongerer that values the worth of a person in war.