I admit my main reason I really wanted DOTF to be in the film is because of its prominence in the late marketing, that left me thinking they were truly going to deliver on the “recovering the iconic scores of every prior film” only to be underwhelmed when it didn’t feature in the film.
Maybe playing the full song over the duel can result jarring. It would be awesome to have a mix of themes for the duel that include Rey’s, Kylo’s and DOTF.