Re: One piece 723
Ideally, it would be beneficial to have multiple haki users in your crew. At least have armament and observation haki mastered to a varying degree. Since now the story is focused in the New World where DF users, especially Logia types, are a lot more prominent, having a lot more haki users is a must. That being said, I'm sure that Buggy has powered up since the two year time skip. Reason's to believe that is that the World Government isn't stupid enough to give the title of Shichibukai to just any pirate. I'm sure that they have their own reason for keeping Buggy around and making him a SB. Location for One Piece being one of them probably. WG probably had Buggy either trained or mentally controlled like Bartholomew Kuma.
“Pirates are evil? The Marines are righteous? These terms have always changed throughout the course of history! Kids who have never seen peace and kids who have never seen war have different values! Those who stand at the top determine what's wrong and what's right! This very place is neutral ground! Justice will prevail, you say? But of course it will! Whoever wins this war becomes justice!”
― Donquixote Doflamingo