Would you like to help research? My understanding is AWP's small case group is too small and also too selective to provide any statistical information. Someone earlier had said they usually wouldn't work on a case suspected of foul play but I might have that wrong. It was unusual for them to work on a case like this one though with an active LE investigation from what I understand.
If you committed a crime and you have both a car and a body that can be easily rolled into a murky lake where evidence will quickly be compromised and they might never be found, it's not a stretch to put it there.
On the other hand, would someone wanting to hide a body even have thought that rolling a car into 18 or 19 feet of water of water would be successful?