My optimal side-story would be T-Bone, Fukuro, and Kaku. It would be the man who can't control his heart, the man who can't control his mouth, and the man who can't control his devil fruit on a boat heading to Marine headquarters to report what happened. I would like to see something happen where Fukuro sees something important happen, but the zipper on his mouth gets caught and he can't say anything about it. Therefore, they would all need to travel on a boat to the Marine headquarters, get Fukuro "unzipped" and report what happens. We may even see Coby and Helmeppo there, depending on how their training has progressed.