There were some interesting clarifying things in the chat.
How does he explain all the spurious sightings at 37SR? Essentially, the police prompted them all. There was one sighting of "Mr Kipper" by HR, and this was the basis of the narrative presented the very next day. Already it was inaccurate, because HR did not identify SJL, but the police said he had. He spoke to MG first before the police and HR told MG what he expected to hear, then when it turned out there'd been an abduction and police wanted to hear about that, suddenly HR had now seen her abducted, too. This account set the entire tone and was disastrously influential. All the later sightings were of what the police wanted people to have seen, and this applies to those a week, or 12 and 14 years later. If you tell people what you want them to have witnessed, witnesses to it will come forward.
What about the couple SJL was friends with? He cut the question off to say he wouldn't talk about that. Interesting.
What about the BW sighting? She was probably mistaken as to the day.
What other hypotheses did the police examine? None, just Mr Kipper, and the focus was on naming and finding him. Later, the focus was on proving JC was him.
When was the car ditched? Not when WJ said, as she has proved unreliable.
What about JC's fake plate, S396 SLP? Seriously? Is that what the case against him relies on? There's no evidence but it looks a bit like SJL's name?
What about JC's "confessions" to cellmates or police interviewers? The former never happened and the latter was not thought a confession by the other officer present.
What about JC's nickname of Mr Kipper? If even true, it postdates the case; prisoners may have started calling him that because the press said he was Mr Kipper.
Has he thought about searching the site? It would cost a couple of hundred thousand - he could barge in and be proven right, but as nobody knows how she died, he could destroy forensic evidence doing so.
What about dogs or LIDAR? Dogs are inconclusive, as you don't know why they're alerting, and LIDAR wouldn't work on the location.
As I've said before, DV's book feels to me like he's given us parts 1, 2 and 4, but there's a missing part 3 without which part 4 makes no sense. Inferentially part 3 entails some connection between the couple he wouldn't discuss and either the PoW, or CV.