I think he moved her...more than once.you are talking about the soft earth area I believe. The story was that concrete was there to stop water accumulating as it ran off the hill to the rear. Police dug down and found a sheet of rock that was quite shallow and went under the house. It was not a possible grave site - the body , if there would have been so close to the surface that ... you can imagine what would happen.
What the LE did not do was empty out the septic tank quick smart. They got around to it eventually. that was a big error or simple laziness.
Look , CD got rid of a body between say 10 pm and 7am the next morning on the night of the 8th of Jan , 1981. Two children were in the house at the time. He "could not" have killed Lynn silently done grave preparation in the previous weeks, not near the house as Lynn would have seen it and got suspicious (and what about JC and neighbours ? ) so in your theory he or he and PD dug that grave and filled it in with an invisible top in 6-7 hours without disturbing anyone sleeping in the house. It seems very unlikely and even if they pulled it off, the grave would be shallow because of all the underlying rock and the corpse might have to be moved.
Each time... a fresh bag of lime.
If she isn't there now in the earth.......she was at some stage.
HIs paranoia and going to bayview for a 'walk round' every time he went to Sydney....
whatcha lookin for CD??