Well firstly, I love the fact that at this stage we can speculate so much. I enjoy reading peoples theories on how the game could go, and its obvious that you've put a lot of thought into this.
But...as for my opinion...I think that this twist is a little silly to be honest. I don't quite understand why, and I seem to be in the minority here, a lot of people seem to be obsessed with the idea of Revan and Bastila being central to the plot of KOTOR2. I understand that they'll have they're role to play, but all this possession nonsense, it just seems, unnecessary and far-fetched and yes, I know, we're dealing with the almighty 'force' here, but this just seems implausible and a betrayal of the work every player put into his or her Revan.