Now only thing left is skills coz Oda is already dead set to hype up Shanks as current strongest.
Look he even has the highest bounty amongst the active pirates...
Crocodile's case is same as old, no strength revelation but considering him being around or above YC1 level but below even half yonko, he got around 600 to 900M boost in comparison to King or Katakuri. Compared with them other than Zoro only coz they both are quite notorious crew in threat just like CG.
We don't know anything about Crocodile combat wise yet though?
He had two years to improve and he definitely did, considering he got back to the New World and became a big-shot enough to gain this much bounty on his head.
Plus his Warlord status isn't really relevant here, he was a Warlord ~2.5 years ago.
While Boa Hancock got 1.6B but with her unique/fearsome DF abilities she might have oneshot Vasco and Catalina but she herself got captured easily by BB as well. Couldn't even evade or counter BB with haki. I believe she's at most YC level but but still got more bounty than even Luffy who defeated two commanders far stronger than BBs current two commanders at amazon lily and survived against BM. Here Compared with Luffy coz he's captain as well just like Boa and situation is quite similar.
Bro BB is a Yonko with one df which hard counters other df users. Ofcourse Boa struggled, but BB himself hyped Boa.
Like you can compare Boa to Marco & BB to BM. And both of their bounties aren't far off, both of them have special dfs as well although Boa's is more dangerous, plus she's a captain/ruler of a Kingdom with Conquerors haki. Sengoku himself hyped Boa's abilties.
Jimbei's previous bounty was around 400M but without defeating YC he got above 1B mark and sitting at the same level as Zoro. Again around 700M boost.
Again, Jinbe was also a Shichibukai 2 years ago.
If they wanted to boost Shichibukai they could've boosted Jinbe in those 2 years itself yet they didn't.
And I already explained the rationale behind Jinbe's bounty, he's repeatedly shown as part of Luffy's top Commanders.
Zoro, Sanji & Jinbe are his Commanders and are the Commanders of a Yonko worth 3 Billion. Which is why it 100% makes sense for Jinbe to have a 1 billion bounty since his boost comes from his emperor captain Luffy.
BB's 2.247B bounty along with emperor titles is justifiable coz he just beat down a group of YCs whiletook hold of most of the WBs territory and a person with 2DFs abilities.
Just like Luffy's bounty of 1.5B after defeating two YCs and dubbed as fifth emperor but no territory so lesser bounty.
But main thing is what did marines reported there HQ to give him boost of 1.7B bounty after Amazon Lily incident and Coby's abduction. Did they make another joking situation similar how Buggy is believed as someone who can tame two monsters or what ? Coby ain't walking uranus weapon whose abduction could be taken so seriously or neither he defeated or fought Rayleigh..... lol
Something must've happened lol.
BB's sudden bounty boost makes no sense otherwise.
The rest of his crew members probably did something notorious, only Devon & Shot came here.
Shiryu & the rest must also been sent on missions kinda like how Burgess alone came to Dressrosa to steal the Mera Mera no Mi.