*de-lurk*

Well, at the end of ESB it's Lando and Chewie who go after Han and I assume that line was meant to pick up the story from there.

Also I'm not sure how much contact they all had with one another. It almost seems like Luke was operating on his own for some reason. Maybe the droids just hadn't heard from Lando and Chewie since before they split up. Certainly Luke doesn't seem to have gotten much information from Lando or he'd have been prepared for the pit trap.

But the strangest thing to me is that Vader seemed to have no plan at all involving Han's rescue. He knew they'd try to rescue their friend, it's how he almost captured Luke in Cloud City. You'd think he would've tried the same trick again. The heroes don't seem worried that any Imperials might be waiting for them either.

I guess some sandtroopers might've shown up after the sail barge exploded, mistaking it for a sandpeople attack until they realised only Rebel heroes are that destructive.