"Do-Do-Do-Do...Do-Do-Do-Do!"

The Twilight Zone theme is running through your head as a spinning image coalesces into view. It's George Lucas, The Flannelled One and he's just returned from a trip through time to remedy something.
You see, George was sitting in his office at the Letterman Centre, watching happily as his state-of-the-art team craft movie magic and he got to thinking.
Letting his mind drift over a hot cup of Chav he thought "I wonder how different the films would have been if I'd directed all six of them?"
Think about it. While no one in their right mind would wish for anyone but Irvin Kershner to direct Empire (certainly not me - I'm interviewing him soon) Lucas was coming off a hot streak. American Grafitti was a monster hit, Star Wars was the biggest film of all time and littered with accolades. You could well say that back in 1977-78 Lucas was at the height of his directorial powers.
So, what if he had directed Empire. How different would it be?
And likewise Jedi? He asked Kersh to direct, but the great man was worn out after Empire and declined. So George asked Spielberg, but due to a probelm with the Directors Guild cinemas greatest living director had to decline something that had become a dream project for him. So Lucas hired the late Richard Marquand, a man some said was brought on board because he would be easy for Lucas to manipulate.
So why didn't GL direct it himself? And how different would it be if he had?
Questions, questions....

"Do-Do-Do-Do...Do-Do-Do-Do!"