Nice pickup and I am not saying you are wrong because I really have no idea where they were.Years ago Chris and Paul Dawson the separated for a day, this was on a news program and both said they hated it and would never ever be separated for a single day again, that's why they're always close to each other, some say Christmas Paul and Marilyn went on holidays to Lake Munmorah on the Central Coast New South Wales ? If Chris is involved then you can count Paul in as well Plus, Paul Dawson and Marilyn Dawson's police statements about going away are conflicting
Why? One of them said they borrowed a caravan ,the other one's said it was a campervan?..... one has a motor the other one needs a car to tow it. Columbo knows Truth and so dose Paul.
It took 37 years for Chris Dawson to be charged after Lyn's murder. It was 17 years after the first coronial inquest that said that Chris Dawson should go to trial.
Paul and Marilyn were interviewed in 1999 17 years after Lyn's disappearance so to get details wrong may be just forgetfulness or terminology.
The point I am making is that it look a lot of investigation to prove that Chris Dawson was guilty of murder. There would be very little possibility of proving that Paul or Marilyn were away or in town and given the evidence to convict Chris was based on circumstantial evidence very little possibility proving that there was an accomplice if there was one.
Some of it makes sense that he might choose a weekend where he doesn't have any family members around so he is not implicating anyone else.