User blog comment:Kaido King of the Beasts/Chapter 902: I Don't Wano More Cake/@comment-27158424-20180420111419/@comment-31434191-20180421213714

Hope they were referring to the unseen Admiral, or maybe a new Warlord. As it stands, we only know five right now, so there has to atleast be one more (two if Doflamingo has been replaced already, which wouldn't surprised me considering how important the balance of the world powers is for the WG).