My theory, and it’s jmo:
That house is a regular gong show. There’s always people coming and going. It’s one of those places where friends can come over whenever they want, you make yourself at home, stay over if you’d like. And it’s always a party. Maybe mom lets them drink or smoke in their rooms. And mom has people over too. Maybe some of these characters were shady and stole, which is why there are cameras “everywhere”.
That night, the teens were hanging out at the house. DB was over. He’s an acquaintance, no? Sometimes you hang out with your siblings friends. He noticed a child in the house. It’s not “like totally random” for a pedophile to have bad thoughts when they’re around children. People came and went. Maybe someone locked the door, but someone unlocked it at some point. It’s possible DB came back to steal something, like a TV, something noticeable. Then he thought “hey this is easy!”, was high on adrenaline and then went back for Cash.
The blood and pocket knife are irrelevant. Red herrings. There could be drops of blood on tissues from a nosebleed, a paper cut, even popping a zit.
But then, I dunno.
That morning someone was AWAKE and somehow knew someone was in the house.
I’m sorry but if I knew someone was in my house and I had kids, I’d check on them INSTANTLY. That’s the first thing you’d do. A teenager isn’t going to call 911 and say “someone was in my house a few hours ago”. It had to have been MS1.
If you’re on the phone with 911 reporting a burglary, I assume they’re going to ask you if everyone is safe in the house, right?
How can you NOT NOTICE.
That’s INSANE.
Jmo