Yeah Buggy became the Yonko, but the chapter clearly showed the 3 : Brannew talked about Croco Mihawk and Buggy. Buggy became Yonko by making Mihawk and Croco obey him and it became a huge threat to the world thanks to the alliance of these three ones.
Brannew said it clearly : the cross guild will be a major, major threat to us !
The alliance of those three under Buggy is the threat.
Brannew showing those three bounties and highlighted them is far from a Yonko and mere underlings. Those three are the Cross Guild, under Buggy yes, but they are.
Mihawk and Croco became part of huge threat to the world, so yes they got an increase
You are contradicting yourself throughout this post.
You agree that Buggy became Yonkou because the WG believed he made Mihawk and Croc obey him. Yet, you also claim that they are an alliance which suggests equality but that is not the case as per WG. Even Mihawk and Croc mention this very point that Buggy was made the leader and they underlings
Brannew's statement is about the future because as already stated, Cross guild is featless as an organization
Your point is contradicted by the chapter. Crocodile and Mihawk wouldn't be beating up Buggy if they thought they weren't being viewed as underlings. Even Luffy and Law mentioned it.
So again the point is quite clear;
-Buggy is viewed as the boss of Cross guild
- His Yonkou status is because his seen as the boss
- His bounty comes from the above 2
-Mihawk is seen as a commander/officer of Buggy
-Mihawk's bounty is because he is the WSS.