Ron, that's really not a bad idea at all. You're on fire today! As he departs from Dagobah, we could maybe have R2 beep at him, and while we're looking at Luke's display interpreting R2's beeps, we could dub in "Tatooine" (from the end of ESB), then we see Luke's face, "I have a promise to keep...to an old friend." If I remember correctly, the shot is on his face, and it would be hard to remove old, but I think that'd be okay.
Ray, I see the logic in your statement, but my thought is this: the Rebellion has never been better off, but they are also a conglomeration of various factions and races and formerly independent resistance groups (hence: Rebel Alliance). While they are able to supply many newer ships, they also realize that this battle is not simply a scrimmage. They're throwing everything they've got against the Empire, old and new. If they lose this battle, they really lose everything.