I've heard a dozen ideas about whose idea it was to do the ghost thing. I remain unconvinced by any,
Yerssot- no, the RPG is not in the slightest bit better than speculation. What it syas is no more authoiritativemthan any idea that you and I come up with and want to say is official. It's an opinion, nothing more.
The DVD has some vague clues, more stuff for speculation. Lucas kept hammering on how he likes cycles, that everything repeats itself.
Well, another repetition is that the mentor dies in the first episode. OB1 in ANH and QGJ in TPM. So maybe, just maybe, it's QGJ that discovers the ghostlike shape..... Who knows. After hearing GL taking about endless repetition and cycles between the PT and the OT, it doesn't sound TOO unlikely QGJ is to appear as a ghost.
I have a Star Wars documentry on tape from the early 1990's and Lucas said it was his wifes idea. He says something about needing to have Obi-Wan help Luke during the Death Star battle. Then it cuts to the other two writers who say his wifes idea made more sense because it added more depth to Obi-Wan and the Force.
But I think we're talking about two different things here. It was Lucas wifes idea to kill Obi-Wan and have him "speak" to Luke from beyond. And at that time it was okay for him to kill Obi-Wan off because he didn't know if he was going to make the other two.
We don't see Obi-Wan as a ghost until ESB.