I think rest of the Rocks Pirate will join those three, and when they will be losing, some of them will betray n leave.
There has to be some betrayal by the core members, the main theme of why too many COC users can't be in a crew.
Kaido, WB n BM won't.
I think Shiki, silver axe, that fat fishman might.
Also, when Rocks will lose, Imu will take over his body, and make him fight Roger, which in turn make Garp join Roger to tag team.
I was inclined towards rest of the Roger Pirates vs Rocks, but Ray is leaving, and Gaban has to give PTSD to sommers or that expression of his doesn't make sense to seem him again after four decades or so.