I really do think its as simple as mihawk doin more to directly fight the marines/wg. Especially if you're right and cross guild wasn't taken into custody for any of their bounties
Or its simply because they just allotted the bounties when their Warlord status was disbanded.
And back then the Marines had no clue that Buggy would have Mihawk working under him & no matter how high they view Buggy, they simply thought Mihawk is stronger back when they were Warlords, that's all.
I imagine they can realese them decently quickly in general after big events.
Blackbeard got his new bounty in after onigashima but before Amazon lily. But he only got the new update after he accomplished something obviously dont know what yet
I dont think its as simple as that, the 2.2 B bounty was from long before the reverie itself - we were only shown his existing bounty in 957. Almost 1+ year of accomplishments got factored in here I guess.
And you are wrong about Amazon lily, the events of this chapter are a flashback essentially - a direct continuation of the events from when we last saw boa hancock during the Marine invasion. So when BB told his folks to bag their bags and get on a ship, it was about invading Amazon lily.
A new flashback begins, it takes place during Marines' attack a few weeks ago. Marines manage to break down the city gateway, but Kuja counterattacks. Marines then order to dispatch the new Pacifistas called "Seraphim” to the frontline and order to activate the recording cameras too. Vice Admiral Yamakaji says there's no sight of Hancock yet.
A little girl with wings and a flame on her back appears in front of Marguerite and Sweet Pea, but they don't want to fight with a kid. The girl, who has star-shaped pupils, shoots a laser with her hand like the Pacifistas we already know.
The events of this chapter (essentially BBs invasion of amazon lily) happened like a week before onigashima & a good number of weeks before greenbull arrived to Wano.