I am still up in the air. I think sexual motivation along with thrill factor. I think if targeted one girl was the primary and the other the bonus. If targeted it was by a perv who came into casual contact with his primary target, perhaps watching for a while.
I think it has nothing to directly do with parental drug convictions although I acknowledge that perhaps the person was exposed to their target victim via acquaintanceship to the Morrisseys.
I do not even believe it will end up being related to the Morrissey drug issues even peripherally. Odds say Elizabeth may well have been the primary target if there was one.
I do not think this was a random, passing through pervert who happened to luck onto the opportunity to kidnap the girls. Local perp, all the way. Still thinking young twenties, braggart, tries to hard to impress the ladies and does not do well with them. Maiden Lane was used and IMO this individual used to party or 4 wheel out seven bridges way.
Lastly, I think the girls were taken somewhere, a property an out buidling somewhere and that is where they died. I tend to lean towards 7 bridges being a dump site for convenience of perp, familiarity and means of transport of bodies, I am thinking pickup truck with tool box or 4 wheeler or some combination of both.