The use of tracked-in music in ROTJ is definitely noticeable in places — the use of “Here They Come!” from ANH during the space battle, most prominently. Are there any other points in the movie where we have a version with the original music? (Is that what ChainsawAsh is referring to, or just this one scene? I haven’t seen that release.) For the Obi-Wan scene, though, I don’t think the score adds anything. It may just be because it’s the way I’m used to hearing it, but I think it’s more effective without music.