If I am add my 2 cents into this.. I must disagree that Lucas is the only one who could have made Star Wars as great as it is. I have no doubt any number of filmmakers from Steven Spielberg to James Cameron could have taken Lucas's initial idea and the creative team of artists he had and come up with something just as good if not better. Especially Spielberg who we have some evidence of proof of that with Raiders of the Lost Ark. Further evidence of this is Empire where his creative input was minimal compared to the other movies. I have really come to believe that he just got really lucky with ANH; luck with circumstance and luck at having assembled a team of unsurpassable creativity.