No, I do not.
I believe that it would likely take a police officer, a “fake” police officer or a person trained or educated in police procedure. There is such a person I have in mind.
The crime scene was, IMO, “staged” to confuse the investigators. This is also why I do not believe the “Grand Jury Three” were involved. It also tends to rule out Cox, although we do not know how badly the crime scene was contaminated by the dozen or so visitors to the house before the police arrived.
Absent such skills, it would seemingly require a a contractor who knew how to do this. If that occurred, it comes down to the motive. Who among all the possible suspects had the necessary motive sufficient to murder three women?