If you think Hancock and Doffy would be serving under Buggy,
Especially Hancock working with Crocodile and them to make Buggy the PK,
You're reading another piece
Mihawk is "working under" Buggy, so don't give me that crap. Even an agenda lord like you ultimately considers Mihawk a top tier.
Oda is Buggy's biggest fanboy. Don't be crying when Oda makes Buggy pirate king before Luffy :)
And at the end of the day, CG ultimately works as a guild than a pirate crew. The commanders all have comparable positions, even though outside world considers Buggy as the Yonko, Mihawk/Crocodile as YC.
Within CG, the crew dynamics will always be that of partners.
Rayleigh and luffy are also close
Hancock is also close to luffy
Her sisters and all of Amazon lily all like and support luffy
Even gloriosa and shakky like luffy
Are Jinbe and kuma also gonna join cross guild
Boa is never going to be a crewmate.
Her character of giga fangirling Luffy only works as an outsider.
If she doesn't join CG, the best you can get is her becoming a member of grand fleet, or an ally like Marco (and potentially Katakuri)