I've spent the last few days listening to quite a lot of the Richard Hill videos and was just about to post the same. Have you watched the hidden confession ones where an expert analyses one of their interviews? It sounds bizarre but the analyst picks up on Kate's mention of (children) brushing teeth and says that mentioning teeth brushing is a sign that she is or has been abused (its so mundane that most people don't bother mentioning it). I also felt that in the interview where Gerry gets angry and says they can't talk about the investigation (he stands up, starts walking around, threatening to take off his mic and walk out), Kate is so calm, almost like she's in a trance, just no reaction at all, and it made me feel like she's learnt to do that when he's angry, do absolutely nothing that could aggravate him more. Even the way he has a hand on her when they walk makes me feel like he's reminding her that he's tgere, but not in a good way, more controlling. I do find it hard to believe that they'd keep up the pretence to such an extent, with fresh appeals, although one main thing that comes out of the interview analysis is that they believe (or know) she's already dead. They don't dwell on or even mention where she could be now, what she could be going through, what she might be feeling - they talk in past tense and its just not how parents of a missing child would think.