Discussion after this upcoming chapter is going to fun for good and bad reasons lol.
Anyway, I can definitely see the Sun and Nox (Dawn and Dusk basically) pirates being the 8th and 9th crews to join the fleet. Should Carrot be the the Nox? Unfortunately it DOES make sense even if you want her to join the crew. Not saying she won't join normally, but there certainly is come contention with Yamato (if there is only going to be 11 crew members total) and that would give her a place with the Strawhats outside of Luffy's direct crew. I can honestly see her, for the remainder of the series, go Poneglyph hunting to help the Strawhats out in the EoS.
As for the former shichibukai, I am curious as to where Hancock, Crocodile, Weevil, Kuma, Mihawk, Doffy, Moria and Buggy will fall in the story, but I have some guesses:
- Hancock: After meeting Koby, she will join him to either Wano or the next place Luffy sees Koby. I don't see her joining specifically (too much personal infatuation with the main character, at least Sanji is a pervert to literally every beautiful woman), but I can see her and the Kuja being the "10th" crew to join Luffy's fleet.
- Crocodile: Kind of the same deal. I can see him having a fodder crew with Daz and both joining Luffy's SHF.
- Kuma: Tragic story that we'll see addressed but when its eventually resolved either he will support the Revo's or return to his kingdom with Bonney.
- Weevil: I still think he's tied to this whole Rocks plot with Kaido/Linlin. Idk though. Very weird anomaly atm.
- Mihawk: Poised to be around, probably with Shanks (good or bad), until the EoS as Zoro's last fight.
- Doffy: Will probably break out of Impel down with Bentham does. I can see Magellan giving chase.
- Moria: Probably joining BB's crew, but I can see him betray him somehow.
- Buggy: Like Moria, I think he will join under BB's crew when we find out what BB obtained (totally Pluton)