I thought it was documented that a British editor did the first rough cut?
In any case, the Oscars Marcia Lucas, Richard Chew, and Paul Hirsch received for editing Star Wars speaks for itself.
This.
All I have to do is watch the prequels to see what a GL film looks like when he has no one around to reign him in or say “no” when needed.
Read the posts above you.
Also there a lot of good editing moments in the PT.
For example, the 123 editing of-“Who could have done this” -cut to- Anakin slaughtering the separatists -cut to- Palpatine monologuing about the first Galactic Empire.
The PT demonstrates very clearly why GL unleashed is not a good idea. There are very few directors who can complete a film by themselves or call every shot while do so without serious fallout. I love the universe Lucas created and I state here today that his best creations were his very first THX,AG and SW. His career following has been mediocre at best unless palling up with Spielberg.