So:
- Mihawk bounty exceeded any expectations, and he's pretty much confirmed Yonko level.
Impressive and it makes sense too as Zoro's final target.
- Croco's too, and it's probably because he's interested in Ancient Weapons (and he's also strong, of course).
- Zoro and Sanji lmao, "Rooftop this, ZKK that, King the invincible God, Queen is low diff for Zoro" and still Oda keeps these two so close to each other in portrayal.
Wings are wings after all.
Anyways, very low bounties considering the threat they rapresents: the WG will find out it really soon.
With Sanji, it's pretty much the same gag Oda did at Sabaody: Sanji be as strong as the members (or stronger) but formally not part of the Supernova's group because he didn't have a 100M+ bounty. Now Oda kept him under 1B for a similiar reason.
Also, Sanji is associated with Satan (Diable jambe, Ifrit) and 999 is reverse 666. Makes sense.
- Robin's one is reasonable, and Jimbe's one too.
He had a 400M+ bounty to begin with, and this was the saga in which he officially joined "Luffy the new Yonko" crew. So a former warlord, leader among the fishmen and strong enough to pulverize an ex WG special agent kinda makes sense. Around 800 would have been more fitting, but whatever.