I keep coming back to the story 'In Cold Blood'... thinking about the Klutter family wiped out over a jailhouse rumor about stacks of cash in a safe at the Klutter home.
The person(s) who committed this personally knew each victim, knew the dogs, knew the area and the property layouts and moved quickly and methodically in the pitch black foggy hollows back roads.
Until we know the est TOD from the victims' liver temps taken at the scene, and the autopsy details as to extent of beating, bruising and # of gunshot wounds to each victim, it is impossible to speculate who was the main 'TARGET' of this carnage.
LE already has that info, so I'm sure the motive and suspect list are becoming clearer to them.
I hope someone on Union Hill Rd had some kind of CCTV camera set up, or at least a Dept of Transportation camera on 32. Somewhere, someone saw or heard something, <modsnip>