I was thinking who the next 13 crowns will be if Iruma becomes Demon King since without Iruma, there will be 12 people left in the class, but then I remembered KALLEGO! So it makes perfect sense! Misfits class + Kallego becomes the next 13 crowns with Iruma as King (assuming the 3 great demons are part of the 13? Is that how it works or are they separate? cuz if so, that blows a hole in that theory HAHAHA)
Remember Nami saying they would need a bigger lightning to defeat Ulti? Considering the foreshadowing skills of Oda-sensei, I think it is Enel
No clue honestly haha but he did say he was gonna return in ch300: http://www.mangago.zone/read-manga/one_piece/mr/one-piece/300/11/
YOSEF REMINDS ME OF ACE FROM ONE PIECE AND I CANT UNSEE OMG