User blog comment:12th Supernova/Chapter 793: Bad News and Bad Translations/@comment-4503935-20150709200130/@comment-2125188-20150709224831

Ok maybe Zoro is a bit of a stretch, but as for Luffy I would not be surprised one bit. Doflamingo is by far the strongest person Luffy has ever defeated. And Luffy's most recent bounty wasn't really spefic on what the reasons were and we don't know what each of those actions are worth individually. The Sabo connection could also come into play, and I know it's been a while and maybe a bit of a stretch, but perhaps some actions from Fishman Island could also come into play.I'd say 450,000,000 at least but I honestly believe it could potentially be 500,000,000. Franky's was just a random guess cause I honestly have no clue. I would assume defeating any officer single-handedly (except Sugar) would warrant a fair increase. Also maybe Zoro defeating Monet (ok technically he didn't but whatever) could also be a factor.

But who knows really, guess we'll just have to wait and see.