captainsolo said:

My questions are: Where the heck did the source come from? Where did it go? Why did they do a new 1985 mix?

I believe that a sans-Greedo-subtitles IP print was made prior to doing the IP prints for the theatrical run.

There's a lot of evidence besides (a lack of) Greedo's subtitles to support this. For instance, the JSC lacks the "Tantive Orange Errors" (http://tx0.org/6jd) that were present in every theatrical print, including the IB Technicolor prints.

captainsolo said:

And are the ESB and ROTJ JSC releases as impressive as SW? If so...my wallet is disturbed by lack of contents.

IMO, yes!