Go-Mer,
I agree with your assessments but from what I've read around the next since this who fiasco started, it does seem that Lucas does have pristine prints of the Theatrical Versions of the Original Trilogy. In a way, it would be ridiculous if he didn't have them.
But, it's really a simple of matter of Lucas doesn't want to release remastered versions of the Original Trilogy on DVD in their theatrical form. It has nothing to do with can't. To him, as you stated Go-Mer, the Special Editions are the remastered versions of the Original Trilogy. It just comes to Lucas' personal preference to regard the Special Editions as his vision of the films. That's all it is.