User blog comment:12th Supernova/Chapter 793: Bad News and Bad Translations/@comment-4503935-20150709200130/@comment-2125188-20150710171845

Just because Usopp has the highest bounty from Doflamingo (who is considered a big threat), doesn't necessarily mean he is the biggest threat to the World Government. Doflamingo determines his bounty primarily based on who pisses him off the most. The World Government determines their bounties based on actions committed and threat to the World Government. Two completely different systems. Doflamingo gave Usopp the highest bounty purely for revenge (not because he's a threat), and the World Government doesn't give 2 shits about Doflamingo wanting revenge (or his bounties for that matter). Just because someone is worth a lot on one bounty system, doesn't mean they're worth a lot on the other (or vise versa). This isn't maths, this is common sense (knowing that the two bounty systems are completely different)