So he fights Avalo captain of the 4th ship.
A lot of fights vs BB crew will be bs anyway.
Only Luffy and Zoro will fight strong enemies. If we assume Kuzan is an impostor then Luffy fights BB, Zoro fights Shiryu.
If Kuzan is really a BB pirate now then Zoro has to move on to him and someone will have to deal with Shiryu and we know it won't be Jinbe or Sanji. @Fleet Admiral Lee Hung 's theory comes in handy.