One thing I had found very disappointing about the Gray storyline was that he was only mentioned twice during series 2 before the big bad finale. In every other episode, it's as if he was erased from memory (okay, so he kind of was in "Adam"). And I just loved that you managed to have him in there throughout so much of the story, not quite in the background but not taking over everything. Just enough that it remained Owen's story and that I so bought into this happy life he started to have without being even remotely suspicious. (I should've known better!) Yeah, it was brilliant and frightening and perfect. I'd say that it should've happened like this in canon, but I suspect that they might not have been able to execute it as well.