I like this idea, simple but interesting... Only a few knows about Imu's existence...
Yeah, it's highly unlikely that only Luffy and the Wings are the only SHs who will fight GKs once they are part of the main objective... All active SHs participated in the fight against the main guys during their first fight against a Shichibukai crew (as a target), against a CP group (as a target), and against a Yonko crew (as a target)... Imu's main forces are the main rivals during the main confrontation which might be the final war so they all must have a counter at that point...
Yeah, it's highly unlikely that only Luffy and the Wings are the only SHs who will fight GKs once they are part of the main objective... All active SHs participated in the fight against the main guys during their first fight against a Shichibukai crew (as a target), against a CP group (as a target), and against a Yonko crew (as a target)... Imu's main forces are the main rivals during the main confrontation which might be the final war so they all must have a counter at that point...
Outside the Rev Commanders, I really don't see who else but the mugi should fight them.