I reckon there’s a reason why Zoro and Sanji were knocked out of the game. They’ll make an epic comeback once they’ve had a power-up.
Imu is somehow connected to his knights. The destruction of the knights affects Imu.
Therefore, when Sanji and Zoro defeat Sommers and Killingham, Imu will lose a portion of his own power, giving Luffy and Loki a chance to force Imu to retreat.
Another likely scenario is one where the powered-up Zoro and Sanji save Luffy and Loki, and Imu, who has a time limit on his stay in Elbaf, retreats. That would be absolutely brilliant, as it would fully showcase Zoro and Sanji as the ‘wings’. But this is less likely than them simply defeating Imo’s knights, who have received a power-up from him.