My theory - apologies I'm one coffee in...
They were taken by someone they knew and trusted
It was very well organised and planned (apart from this last dumping)
They were alive for the last 100 or so days
The 110 house sweep 45 days ago caused someone to panic and kill them
The motive was not sexual for the perp, although such may have occured as a side effect. The motive is something other than sexual.
There is more than one perp.
He is local.
He is familiar with the dump site OR the accomplice (s) who did the dumping was
He is local...I'm saying Waterloo.
He has a criminal history - a long one
He is in his 30s or 40s (this is no Austin Sigg) but his accomplices may be plural, and much younger and/or female and heavily under his influence for some reason.
This is an execution style murder rather than a violent assault murder - I doubt the girls were physically harmed in any way other than their final moment.
The girls were walked in separately and executed by two different perps.
All my opinion only based on what we know so far and it could change any time some new detail comes to light.
It makes me sick to think they may have died at the hands of someone they trusted, but maybe they never knew or suspected a thing. Maybe they were on a fun secret holiday in their minds, right up until the last second. :sick:
I'm thinking along the same line SapphireSteel... unfortunately.