Gaban giving more input on what he knows of God Valley, how things have been since Roger died, maybe what happened with the rest of the crew when they disbanded (not important but I'd like to know where they headed off to last he saw them) and what he's done over the years could be cool, of course along with whatever big input he has for Luffy (how the crew found Shanks which will explain Shamrock and maybe some big reveal.
For once I don't mind a big confrontation being stalled. Luffy and Gaban meeting is pretty cool. I'm glad we're getting to seer him, the few panels in Wano were nice but not nearly enough.
I wonder what'll be the opportunity for Usopp to prove himself this arc. I'd love for him to improve on his haki. Learning basic armament wouldn't be bad, but more importantly I'd love to see make good use of that observation haki of his to do something great.