one thing we must keep in mind in discussing qui-gon's possible return in a form other than the pre-recorded hologram, is that GL has thought all of this through. Here are the facts:
Anakin, Yoda, and Ben all vanished when they died. They all became ghosts.
The only ghosts we have seen have "attached" themselves to Luke shortly after they died.
We have only seen good Jedi become ghosts.
As of ANH, it seems Anakin/Vader (and thus jedi in general) is unaware of the "ghost trick." However, this necessitates the question: If the ghost trick is not common knowledge to jedi, how does Anakin learn it b/w EPIV and VI?
Qui-gon does NOT dissapear when he dies at the end of EPI, and still has not appeared as of 10 years later.
Anakin, Yoda, and Ben all vanished when they died. They all became ghosts
Still discussion about the link
We have only seen good Jedi become ghosts.
Because we are not in need to see a Sidious ghost
As of ANH, it seems Anakin/Vader (and thus jedi in general) is unaware of the "ghost trick." However, this necessitates the question: If the ghost trick is not common knowledge to jedi, how does Anakin learn it b/w EPIV and VI?
It's Vader in ANH, twisted and evil...
He just didn't learned it, or they didn't told him...
And ANAKIN becomes ghost because ... well, he IS the Chosen One!
I heard that the official site says he disappeared or at leats that McCallum said it.
I still don't believe it. And if it IS true, then I think ROTJ is VERY VERY VERY flawed in not showing it. I'd consider a major ERROR, almost unforgivable and I think GL should fix it then in the SSE on the 2006 DVD.