why does it really matter if he knew or not. heres something from the EU for you. commander pellionon(sp) the grand admiral of the Emperial remenant, new that the empire was controling the fleet in the battle of endor with the force. he was the one that saved the fleet when the emperor died, so if he knew of course tarkin knew. and thing though the sith worship a different doctorin then the jedi. even thou vader is evil he still cares about honour a jedi trait. u think papls ever cared about that.