As a full time law clerk, you should know better than to make such a gross oversimplification of IP. As a law student in my final year, I certainly did. While it is rare that a studio would deny a director in this day and age the opportunity to revisit and revise his film (pumps up the DVD revenues), prior to the video age allow him to attempt any modification would be (at the very least) unusual. As to your point in (c), if GL had sold the films to Universal, he would have to get permission from Uni to use the substantial parts of the films that would be duplicated in his SEs, or work out a distribution deal with Uni to avoid the headache. Universal would be the owners of the copyright unless it was a distribution licence, as was the case with GL's arrangement with Fox. I refer you to s. 201 of the Act in question, which refers to transfers of copyright, as well as works made for hire, which is the usual arrangement in filmmaking.

As to s. 106, I fail to see your point. We have already established that Lucas owns all copyrights pertaining to Star Wars. What exactly are you getting at?