Is that kind of a fluke though? Because Never Say Never again was utter shit.
The only movie by Kershner i have seen that was good was The Empire Strikes Back. So i believe it was collaboration more than anything. You see you had Lucas when he was actually still a good filmaker, Kasden when he still could write, Kersh when he could still direct and Kurtz as the producer.
Plus some of the best work of the Old ILM, John Williams Score, the actors gave good performances. Some of the best Cinematography in the saga. They actually put out a sequel that was better than the first film. Something that rarely happens in film.