what makes me think the winner has to be a dwarfing superpowerhouse is this: all the winners and diamante are still in this thing, with barto being the only one that can be turned 'fodder' without interfering with the story-progression of this arc. burgess is too important as one of blackbeard's very limited crew, and will probably make like his captain and run away once he sees someone superpowerful. but that still leaves it up to sabo+barto to defeat mystery-d, as well as diamante if it even gets that far (it won't - are we really going to see lao g and the rest of them fight? unpossible) and i just can't picture sabo losing the mera mera no mi in a normal, got beat-up kind-of a way
with what has happened recently, oda almost needs another superpower appearing ala shanks during the war to end this cleanly, lest we lose tournament-plot advancement for a lot of very important characters (sabo most visible of them all).. it can't be kaido because that just poops all over the entire arc; he'd instantly become the number one focus for the rest of dressrosa. and while i'm sure at some point the coliseum floor will break and everyone will crash in to the toy factory, it seems like all these story lines need to stay separate for at least a little while longer (luffy hasn't found his way out of the coliseum yet - else why waste all the panels of him talking to bellamy about leaving?). all that can/should happen after everyone gets to the royal palace, but nobody is there yet - i dunno i probably need to stop typing now because i'm ranting. someone help me think through this?