What’s everyone’s theory? Mine is that he had help from someone very close to him to this day and they are very confident Lyn will never be found.
There's no reason why Chris Dawson couldn't have done it unassisted.
He spikes Lyn's drink the night before and suffocates her while she is out to it. Or just straight poisons her.
The next afternoon, after returning from the pool and with the kids off with grandma and JC out of the way playing schoolies, he has plenty of time to do whatever he chooses with Lyn's already dead body.
Chris Dawson is a big guy and he would have been quite capable of carrying Lyn's body to his car concealed in the garage and then driven her to a burial location of his choice. Equally, he could have put her in a wheelbarrow and moved her to somewhere closer by and buried her.
Killers tend to dispose of bodies in places they are familiar with. So places Chris had frequented or holidayed at are logical locations for Lyn's body.
That Chris Dawson is said to have repeatedly returned to the house for years after he sold it, even talking to the owners on one occasion, has me wondering.
If somebody helped Chris in any way, logic points to Paul. Who else could he trust unconditionally? If it had been someone else they would have struggled not to tell someone over the course of 40 years and that's how most cold cases finally get solved. I have no doubt Paul knows something but how much I don't know.