<modsnip - quoted post and response removed>
The discussion regarding this case seems to be circular. I wish people would drop the discussion about JK and MH; there is no realistic possibility that they were involved in the crime in any way (beyond carelessly contaminating the crime scene). Neither one of them was even remotely capable of pulling this off.
If DR did this, I don't think he did it alone; I think there would have been an older accomplice directing things. DR is a follower, not a leader.
If this was a premeditated sex crime, Suzie was probably the target. (Stacey didn't live there, but someone might have followed the girls to the house that night.) Few sexual predators would go after someone Sherrill's age.
If this was a contract hit, then I think Sherrill, not Suzie, was the target. The plan may have been to simply kill Sherrill in the home because she was supposed to be alone. The lackeys who were supposed to carry out the crime may have abducted the women simply because they were only capable of following orders, not making decisions, and they didn't know what to do once the two girls showed up.