User blog comment:Kaido King of the Beasts/Chapter 906: What is This, a Crossover Episode?/@comment-27930128-20180601080026/@comment-35541306-20180601131956

i would guess the assassin is one of kaidos guys cause joker losing to strawhat pissed kaido off real bad. the shadowy character who went and looked at the treasure looks like someone from cp0 probably, at least to me.