I think he killed her the friday night (hid her temp) and disposed of her sat night/sun early while the girls where safely out of view at Lyns mothers.If geoprofiling is applied....using the 'least effort' principle.. On the grounds that we all know instinctively where we are, and we know how to get back using the same track. And we unconsciously choose the route we know best.
In this matter, we know where he started from, and we know where he finished up that Friday//Saturday. A start point, and finish point, and I am assuming that he did not wake the girls and take them with him to hide Lyn's body. He could have, but it is a big jump, and those girls were not babies.
Theory - he kills her between 11pm and 1am Sat. He has 6 hours min, or if he kills her earlier, 8 hours, as he has to be back at home to wake and dress the girls.. say, he has to be back at home by 6.30am. 7am . And then take off for the Saturday job, at Northside pool with the girls.
So that makes it 3 hours out to the hiding place, , hide the body (1hr) and 3 hours back.. so a radius from his home of no more and most likely , a lot less than 3 hours in any direction. This is generous timing, not accounting for the shakes, for creating a hiding place, for taking a few wrong turns, etc,..
So ... Sydney , somewhere, and most likely, Northern Beaches, familiar, cosy, well trodden trails for all his life. On that night, he would not branch out into any unknown territory, with the cargo he has, and the necessity to off load it quickly. Not the night to try a strange freeway,...
That's if her body isn't extremely close to his house. It isn't far away.
( geoprofiling is usually applied when a body is found and the need then is to trace out where the killer started from and where he went back home to, on the grounds that even killers go back home , they don't disappear in a puff of air..
But in this we can postulate on the reverse. We know where he began, we know where he went back to , to pick up his daughters ......we know approx what time he would have started work at the pool. )
whether that allowed a deep hole on the property or a trip into bushland or the local tip.....time was on his side.
