Speculations Crossguild will become the ex-Warlord Crew, the latest Chapter all but guarantees this.

[Monkey D. Luffy]

Honestly removing Law from this just makes an easy 7. He and likely most other Supernova will be Luffys endgame allies anyway. Plus, i really cant see him working with Doflamingo

It's either him or Mingo, and between him and Mingo, I think they're more likely to recruit the latter.

 

[Konstantis]

She won't be a subordinate to the "clown."

Buggy is Clown, plus Boa will never accept Man as someone superior to her, if that is not Luffy

 

[zzShinichi]

It's crazy that 7 Shichibukai could probably fight on equal round with a Yonko + his executives.
Mihawk Doffy Kuma Hancock Jinbei Crocodile Weevil could totally fight and defeat the Big Mom Pirates