Well, there's nothing saying that if anything is added, it's just when the Falcon is coming back (ie similar to the background stuff in The Last Battle in ANH:R, you just show the TIEs above the city fighting with cloud cars and other ships trying to escape, with smoke coming from where the city on top is being pummeled).

Hell, at least show a plethora of ships in the distance all around the upper area of the frame showing the mass evacuation. ANYthing to add some life and show what Lando gave an order for.