Thanks skyjedi2005,
This does answer all of the questions:
http://secrethistoryofstarwars.com/natureofthebeast1.html
Marcia also kept Lucas in check by reminding him of the fundamental emotional resonance needed for a screenplay, in contrast to Lucas' more technical interest: "I was the more emotional person who came from the heart, and George was the more intellectual and visual, and I thought that provided a nice balance," Marcia says.
Mark Hamill remembers, "She was really the warmth and the heart of those films, a good person he could talk to, bounce ideas off of, who would tell him when he was wrong.” After a three year process of finally filtering and refining his ideas, Lucas had a script that was imaginative and human.
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This was an eye-opener article and things seem clearer.
Lucas' was into more technical and visual side seems to me to fit the prequels which are all eye-candy and souless.
It also seems to me the Special Edition had edited out all of Marcia's warmth and the heart of the films. The Marcia Lucas edit of the oot seems to me to have a more epic and grander look and feel than George Lucas' re-edit in the Special Edition.
also Marcia could tell George Lucas that he was wrong which is something no one around him does or dares to do, these-days.
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The George Lucas of today: