As I said before, your theory fits the available facts but is still nothing more than a theory. There’s nothing in the films that directly points to this as the reason some Jedi disappear and some don’t. And there’s certainly nothing in the OT that points to this at all.
I don’t get what is so hard about looking at evidence and coming to an obvious conclusion. Why would Lucas write in the Qui-Gon thing that makes my theory work and not have had that in mind?