Did you figure out how Linus is in on it?
Nope. That email from his mom doesn't match anything else. He could just be a foil, someone to show how the MC is drifting further away from the mundane world.
What I
am wondering about is the identity of the strangler clown. It's a woman, and Silent1 claims to be her during the next chat. This poses an interesting question, given that RECENTLY is at least ten years old. In a proper detective story, we should be able to deduce the identity of the criminal, so it can't be someone we don't know.
If Silent1 is telling the truth, she must be a middle-aged woman. There simply aren't that many of them in the game. There's Carmen and there's the new substitute teacher, both rather unlikely candidates.
If Silent1 is telling a lie, then they must have ordered someone to half-strangle the MC. It doesn't have to be someone we know, but I think it is. It's not Sam/Lidia/Maggie/Haley, Kristen, Alexis or Emily for obvious reasons. This leaves Leah and Valerie as two possible perps, and I think it's Valerie. (Heavily hinted at by her saying "I will let you breathe" in the MC's dream)