But remember Empire Strikes Back is the only mainstream movie Kershner has made that was any good. People attack Lucas for making bad movies but don't put it in the proper context when you realize Kersh also directed the turds that are Robocop II and Never Say Never Again.
Also people praise Gary Kurtz but other than being involved with The dark Crystal and Return to OZ after leaving Lucasfilm what has he done?
He did produce that horrible science fiction slipstream which only was cool because it had Mark Hamill as a bounty hunter named Will Tasker.
All directors have their share of bad movies.
Steven Spielberg is often praised but he has made some awful films as well, so has Coppola and Scorcese.
And nothing Lucas friends have done could touch the greatness of star wars imho. Not even the collaboration by lucas and spielberg raiders of the lost ark.
Not even the Godfather has had the impact on generations of people that the original star wars trilogy has.