Thinking out loud for a minute ..... with a pinch of occam's razor thrown in ....
Whoever did the killing would have expected security systems and cameras would be present in the house .... and not taken the risk .
However it is apparent (at least to me) that the suspect(s) knew there were no live cameras and knew the camera in the pool room was disabled or turned away.
(To me) that should greatly narrow down the suspect list . It has to be someone who knew the house very well.
Anyone else agree ?
I agree with you.
The killer (‘A’- close to the Shermans) knew about the normal lack of, or lack of use, of a security system.
But the prior to the house being on the market, it might make sense that the Shermans utilized the security features. Maybe make sure the camera was operational.
If not for their own protection, but as a selling feature. When you sell a home, whatever is in place should be in working order.
Why I think the killers may have used the camera: Just speculation, but if one of the killers was known to them, they might want to ensure the Shermans were dead but from a distance.
Killer, or killers, brutally murdered the Shermans. Maybe the order for the murder was to make it look peaceful, or like a m/s. (HS suffered facial injuries, that doesn’t fit my theory.)
Click on the camera, bodies are staged in a manner where if they moved it would be obvious. Check at one point, then 20 minutes later, and again. Just to know they were deceased.
Before leaving, click the camera off or leave it if it was working.
The Shermans were facing away from the pool, so maybe only a side profile of their faces (or just BS’s face) were visible. Maybe killer ‘A’ didn’t wish to see their faces after their deaths.
We know the murders were brutal. Maybe the staging was to make it appear less horrific than it was.
BS, legs outstretched and crossed with his glasses on his face, may have appeared to have passed peacefully. (Despite the belt.)
Remember Greenspan saying he KNEW that the pool area hadn’t been vacuumed by TPS forensic personnel? Maybe he knew because they were remotely watching the crime scene via that camera.
Or maybe that was the point of killing them there- they could have film and audio of the crime scene investigation. (?) Not sure if that’s possible, but what if?