It may be a bit late in the game for a change like this, but am I the only one who finds it odd that the emperor waited several years after the events of ANH to talk to Vader about Luke Skywalker? It seems like this is the first time they're talking about it. Doesn't this seem like the type of conversation that should've occurred shortly after the battle of Yavin, and not several years later once he's not only destroyed the Death Star but probably done far more rebel activity that was bound to draw their attention?

Would it be possible to move this to the beginning of the film and add an indication that this is shortly after the events of ANH? Or at the very least could someone give a justifiable reason for why the emperor and Vader waited so long to talk about such a major new figure in the rebel alliance?

And please note I am not suggesting making the entirety of ESB take place shortly after ANW, only the scene between Vader and the Emperor and then jump to several years later with the probe droids being launched.