Here's where I'm at, subject to greater enlightenment
Ted Bundy type, sees a house full of pretty blondes. Sneaks in while the house is empty, lays in wait. He was so good at what he did that he killed all four people, attacking them all in their sleep. Didn't even wake up the others in the house. In and out like a ghost. This was planned and executed well enough that there wasn't even a 911 call until 8 hours after he was gone. He won't show up on the truck video or the bar video.
Riders on the storm
By the time I get to the end of my thought process on any theory, I’m immediately confounded by at least one, usually 2-3, of my very own BUT, WHAT ABOUT this counterpoints.
1. Going with a Ted Bundy, fetish for pretty young blondes theory, the killer catches sight of one or more of them, follows them home, and starts casing the house. Once he realizes there are 4 pretty young blondes and a pretty brunette to boot live there, he’s all in.
BUT. Why kill only 2 of the blondes, the brunette, the boyfriend, and leave the other 2 blondes untouched? How can he know with absolute certainty that neither of them witnessed anything? Imo, a killer who brought a combat-style knife to his chosen murder scene and slaughtered 4 people is not going to be deterred by a locked bedroom door. Imo, under this theory, this killer knew the bedroom layout and knew all the girls were home. (See 2.)
2. If he makes entry while the house is empty, does he survey the layout for bedroom locations? Or does he already know? I just got a creepy feeling that — in this scenario — it would be someone who had watched the house, the girls, their comings and goings, and had done a practice run, i.e., entered the house before while empty.
BUT. He has to know that multiple people besides the 5 girls come and go at all hours. I watched the interview video of the 3 neighbors, a young man and a young couple. (Don’t remember the news source of the video so just hope I’m not about to break the rules on my first ever comment as a newcomer to WS.) The gist was that the girls seemed to be quite popular and had small gatherings of friends a few nights a week. It was all described as very normal, typical college student activity with not so much as a hint of wild or over the top behavior. Assuming the killer is aware of this, he’s taking a huge risk by lying in wait when 10-15 college kids could roll in at any time …… which then takes me down the behavioral analysis rabbit hole. Is he risk-averse or impulsive? Is organized or disorganized killer?
Et cetera and so forth. I just want the killer apprehended. The sooner the better.