Excellent explanation, CatBus. Thank you, and I see your point.

Interesting about JEJ. The IMDB trivia page says:

James Earl Jones supplied the voice of Darth Vader, but specifically requested that he not be credited. At the time, the reason he cited was that he felt he had not done enough work to get the billing, but he later admitted that he didn't want his name associated with the film because he was still an up-and-coming actor, and didn't want to be typecast. Jones does receive billing in the subsequent sequels and the 1997 "Special Edition".

I wonder if he OK'd getting credited in the SEs. I assume, by 1997, there was no danger that he'd be typecast as a Sith Lord ;-)