User blog comment:Kaido King of the Beasts/Chapter 906: What is This, a Crossover Episode?/@comment-27930128-20180601080026/@comment-244290-20180604024649

The headgear looks like a huge crown. Maybe a World Noble patriarch, but it is possible that a whole new rank could be introduced this late just to be taken down.

The World Nobles want Doffy shut up, so he never speaks about the secret national treasure. He has little to lose at this point, so he might blab, and he has no leverage anymore, so they can kill him without much consequence.