Killingham and Sommers is too much for rest of SHs. They have immortality, Gunko before Imu enhanced her, had already captured all of them together in one swoop.
I wish Z/S face against the Giants, but Killingham and Sommers might just be it. HKs are also the ones truly evil and need to be defeated.
Jarul/Jinbei help could face against one of them Dorry/Broggy, and Hajrudin is also there with rest of new generations giants to face the other. They need to hold them off until Luffy defeats Gunko.