The introductory chapters featuring Loki and Harald, yeah, that’s a given.
But everything involving the Rocks Pirates, Hachinosu, the Kuja crew and Shakky, Garp, Garling, and the Roger Pirates, I’m convinced that part of the backstory will be in the movie.
Just imagine seeing a young Xebec sitting at the table across from Harald, seeing him fight in a Davy Back Fight back in the day, and seeing him destroy the eyes of Hachinosu Island with his entire pirate crew striking a pose.
Imagine the arguments breaking out among all those pirates in Shakky’s bar.
Imagine seeing all of that on the big screen at the cinema.