Pretty interesting speculations. What about the big deal made over Qui-Gon and the Living Force? It seems that in the movie and on the Starwars.com characters page they make a distinct attempt to let everyone know that Qui-Gon sees the force differently than other Jedi and is therefore not on the counsel. He advises Anakin, "feel, don't think". He's all about the living force and later in ANH Obi-Wan adopts the same mentality with Luke. Is it possible that Qui-Gon has something to do with the Jedi ability to disappear and become one with the living force? He could also appear in Episode III to instruct Obi-Wan and Yoda how to accomplish the feat. That doesn't explain Anakin/Vader except for the fact that Anakin is the child of the force and then could be a part of the living force automatically??? Who knows, I am sure all will be cleared up in III.