I heard the killer locked the victims bedroom doors and that survivirs couldn’t get in, called the police saying they were “unresponsive” meaning they wouldn’t respond to their knocks, calls or attempts to open the doors.
I hadn’t heard that the bedroom doors were locked, but that would explain a lot.
One of the concerns was that the two friends of Ethan who entered the house (one was a BF to one of the victims, also)
were also potential perps, which contaminated the scene.
Surely, one or more of the victims scratched the assailant and had DNA under their fingernails or some other particles.
I wonder, who was the first? Was it Ethan? And, did he discover the perp entering the house (or let them in)?
It was pointed out that the first victim would only have their DNA and the killers - not the other victims DNA.