Buggy was always a gag. But he still is a yonko.
Croco got scaled accordingly. Oda has said he regretted introducing him too early.
Moria meh, he might still play a role.
Doffy was a great antagonist in Dressrosa and he might still break out and have a role to play.
And these are the "bad" warlords lol. Coby is not even close to the relevance they have.
And no, the marines were getting bullied even before Boa entered the ring. Coby was bargaining. The fact of the matter is, Coby actually did nothing there. Accomplished nothing at all. If oda really had meant for coby to be a strong marine, he would have shown it there. But he didn't. Coby was the one who got the role of Damsel in distress.
Buggy hasn't been done right.
Moriah hasn't been done right.
You are now assuming that doffy and moriah will be done justice. But have an issue with me assuming based on the narrative that they won't be done justice? Interesting
The marines weren't hence why the Kuja pirates stated that they were coming closer snd closer into the island. The same marines were fighting and pushing through for days. So that point of your is also factually incorrect.
If oda really wanted to show boa as a strong warlord he would have had her low diff coby the same way doffy low diffed smoker. Ain't that hard to understand
The relevancy argument is terrible since the mc of the series disagrees with you and a new yonko whom is the enemy of said mc disagrees with you. Amy one whome blackbeard seeks or or captures provides relevancy to the plot moving foward. Oda literally wrote "ok boa I can't have your fruit? No matter I will take coby whom is just as important as yout haxxed ability" lol.
Oda even had this very same yonko gave history with a so called "none important marine" lol