MOO: The idea that someone, especially E&X, saw something and the murder was committed to avoid consequences is not bad in itself, but imo it mainly does not match the weapon choice nor the crime scene. I think that would allign better with a fast, clean kill, not excessive stabbing.
There is no reason to assume E fighting the prep, other than some cognitive bias via internalized sexism, imo. All victimes were told to be "
likely asleep" and the only one who has been mentioned to
have defensive wounds was X.
MOO: I'd say
B by far on the first (perp knowing the victim), followed by some combination of
C-
A-
J (perp not knowing the victim at all or at least not notably well) and
K) was planned to be SA, but changed into murder (perp somewhat knowing the victim, inc stalker etc)
Some people have commented on my remark interpreting that as insensitive. I'm sorry about that. MOO: I get the probable emotional reasoning behind the dad mentioning them sleeping in the same bed. I just wanted to be as neutral/factual as possible and leave the door open for the not-really-probable options like maybe LE told him to include that bit of info, either because it was not true or because it was connected to the presumed motive, because they knew the prep would be at the vigil and wanted to observe his reaction. Extremely unlikely, I know. There could also be other unlikely reasons, like doing in in spite of the PD etc.
MOO: a killer like that might have no empathic feelings
towards the suffering of his victims. That does not mean, that he has no feelings. Especially, someone who has taken such an extreme measure like killing someone, moreover killing 4 people over no obvious motive, is probably
very emotional in a way. Mainly, very sensitive to not getting his way. So if the walls start closing in... they refuse to deal with the consequences. Some even write a trashy-novel-style fake cover story in their suicide letter. Look at
Brian Laundrie.