User blog comment:JustSomeDude.../Where'd They Go?/@comment-24769684-20140831122043

Jora: Probably hiding somewhere, traumatized and turning things into art. Since she's suffering so much, her art will be magnificent masterpieces and she will start a new life as a billionaire artist (conversely, many of the towns she visits often report several missing people)

Other Colosseum Fighters: Probably part of the mob looking for bounties.

Burgess: Probably left before Birdcage started.

Sunny Crew: Probably won't see them until after Doflamingo's defeat, and they will probably pave the way to the next story arc.

Koala: Will probably show up soon to assist in the destruction of the SMILE Factory, since the factory destruction team is now composed of 1 Straw Hat member and a few dozen dwarves. Probably not enough to do anything significant.

CP0: I'm thinking they'll show up at the very end of the arc and their true purpose will be revealed, but they won't be antagonists until later.

Personally, I feel kinda sorry for Buffalo. He is one of the few characters to get completely thrashed the first time we see him, but then got a second chance in this arc...and then proceeds to stand around, until finally he gets into the action...and then gets his neck snapped within a few seconds. I nominate Buffalo for having the saddest life of everyone in One Piece.