Kersh said he appreciated the expanded Bespin, but he also said he was glad it was changed so little, and he seemd to diplomatically indicate he wasn't a fan of the new wampa. But the point is: he wasn't given the choice. It wasn't his doing and he had zero involvement or consultation. If it were up to him, he would have never touched the film, because it was what it was and he was proud of it and had moved on and didn't think it needed to be revisited. All Lucas did was give him an advance screening, not for approval but just to show him what he was doing to his film.

Kasdan, on the other hand, didn't see the film until it premiered. And of course Brackett and Marquand were long dead.

Essentially, according to the Berne Convention Lucas was so aggressively trying to get Congress to recognize, Lucas produced a million dollar fan-edit, since they were other people's films, even though he had a hand in them. Like all fan edits, his version is good in places, bad in places, with some changes that are appreciated and others that are bewildering, but at the end of the day you would never want them to replace the original.