I’m sure Ady is pretty set on his additions and changes now, but I thought I might throw out one other idea.
At the end of the final space battle, I think a shot of Star Destroyers scattering into hyperspace would be an interesting addition. Not only would it give a little more context on what happened to the rest of the massive Imperial fleet (did the smaller rebel fleet destroy them all, did they surrender?), but it also could foreshadow the eventual return of the Empire as the reformed First Order in the next trilogy.
That sounds really cool, and idk how adywan is planning to shoot Endor scenes or if the 501st will be involved, but if he had imperial officer garb, it might be cool to use to have a star destroyer admiral say “Recall the fleet. The rebellion my have one this battle, but the war is not over…” (or something like that). Alternatively it could be easier to use you hyperspace idea, and have a few beats of the imperial march play just as they leave. Like you’d have to pick the right moment to cut to and the right part of the score to pick up an leave, but it could be extremely menacing.