Yes, for the line theory to work we need more than the location of two bodies.I'd guess that whilst he was kicking his heals at the Stores Depot in Miles Rd, and watching the main depot being built next door on Kewdale Rd, that he might've discovered all the nooks and crannies, and spaces where things could be stored in perpetuity whilst maintaining an eye out for any unwanted attention upon such a site. If they prove that the accused had anything to do with the CSK s of course.
As to predicting a body location for SS, it could be anyone's guess, but if there were more known locations, say for argument shake, Dorothy and Kerry and those distances from home and abduction sites could all be put into a computer, then things like averaging increasing distances and directions could be computed, maybe a few rough target areas for searching could come up, but it's still down to luck in the end.
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