I don't know if they'll have a say on Oda's vision as a whole, but I hope they're an observant fellow who will help him plug up the little mistakes that keep appearing too often.
A defeated prisoner just pulls out his legendary swords. He could use them to free himself and his subordinates, since he sets them free anyway. But nah.
Redo the panels and have somebody like Shinobu give Toki Oden's swords and message. Or just say the cage is unbreakable seastone.
Prometheus's first apperance since the Reverie arc. A speech bubble like "I flew right over to Onigashima from the ship as soon as Mama called me" fixes that.
Orochi forgot Hiyori is alive. You just fix that line of dialogue for the volume version.
Oda is not perfect. And these things don't affect the story very much, but it's still quite annoying to see them persistently show up when they can easily be fixed with basic editor oversight.