Find: I don't remember the profile on how killers dump their victims. However, I've created my own little science, as you know. (And of course mine is amateur, LE has the true science).
For the most part, I find them quite predictable depending on their profile, their deviancy. I find them especially predictable i they are the macho, possessive types that just "snapped". The Perps with various, more complex psychological disturbances are harder to predict, and have varying disposal methods depending on their sense of reality, and particular deviancy.
In this case, I believe the Perp falls in to the latter category. Again, this is just my amateurish deductive reasoning.
I think he had adjustment issues from a very young age. Probably some maternal lineage history of mental illness. I see him as a bedwetter, animal abuser, beat up younger siblings, if he had them. Lacks empathy. Secretive and ritualistic in many aspects of life. Has had minor brushes with trouble, but clever enough to avoid detection for the most part. Very few friends, if any, maybe one "stoodge".
Heavily in to video games, has history of fire setting. Lots of stories and rituals in his head, knows he needs help but his impulses are too strong. I don't think he ever viewed VM with admiration, this was pure fulfillment of his ritualistic impulses. However, I do think despite his lack of empathy, he does know he did wrong and wishes he wasn't the way he is.
I 100% believe his parent (I believe it's a single mother most likely) knows he did this horrific act, and is staying silent to avoid the disgrace the revelation will cause. Of course it would alter the course of that family's life forever. It already has. I believe his crime is known, and I pray those with knowledge will have the guts to step forward. Further, I believe that forensics will ultimately confirm what I believe LE already knows.
Lots of opinions and speculations from me today! And of course, as always, all amateur speculations. LE's got this. I know they do.