I found this on shampoopoo.com 's forums. It appears to be posted by someone who is close to Lucas.
There is a scene that talks about the whole blue ghost thing, and why Qui-Gon doesn't have one. It'll be explained some what. I'm not sure you'll be happy with the answer though.
As for Hyden in ROTJ... we can't figure that one out. I'm going to ask George about it. I'm sure he'll have some bullshit answer, and won't really care that we don't like the idea.
I guess this should answer the question.
🙂
corn