The Warlords having such high bounties shows how crucial they were to the World’s balance, and how dangerous they could be if left unchecked. Crocodile ran an entire organization under the Government’s nose, and had the key and know how to acquire Pluton at one point. He then breaks out of Impel Down and starts an entire Guild which now is composed of former Warlords. His approximately 2b bounty is earned, imo.
Mihawk possessing a bounty north of 3b really speaks to his strength. And the fact he was once known as the Marine Hunter is an obvious callback to Zoro the Pirate Hunter. But unlike Zoro who was renowned across East Blue, Mihawk’s fame is on a world class league.
And Buggy continues to fail upwards, though I wonder if the rest of his core crew members followed him. During the buster call on him, he was seen trying to escape on his own. If they’re in Impel Down, we could see Buggy and the rest of Cross Guild try and spring them loose, which may lead to Doffy joining the organization as well.