Funny enough, I've had a theory that all 10 will be commanded to destroy the capital once Momo ends up saving it from Onigashima.
There is a reason Oda drew this with Apoos intro:
At first I thought it was to give the scabbards something to do (back when i thought they were stronger and when I thought Kanjuro would turn out good).
This Usopp theory is really nice though, entirely redeems him this arc if it happens