i was thinking basically the same thing. he tells the people he's with to "bring his shuttle" they go get his shuttle and radio to the Executor to prepare a docking bay for Vader's arrival. Vader shouldnt have to spell ever little detail out for his 'staff' if your working directly for Vader you should be somewhat competent (otherwise he would have killed you by now)
but dont forget, his whopper should be ready at the drive through window when he pulls up
-Darth Simon