So can you post the source of Mihawk officially serving Buggy? Even the characters in verse (like Zoro, who trained 2 years with Mihawk) acknowledged that Mihawk wouldn't work for Buggy, with the narrative being that Buggy was talked up to this position by the way the world perceives him. Why are you being dishonest?
Also, Kaido stated that SSG is a weapon capable of stopping them. All while having the advantage of being reliable, since the reason the Shichibukai were disbanded, was because you cannot rely on them. Because they will destroy and enslave countries while having complete immunity. And both the Gorosei and Akainu were against disbanding the Shichibukai.