This is really well reasoned.
May I go one step further? I don't think this was a pre-planned mass murder: I am convinced it was a pre-planned single murder. And had it been a single murder, it may have followed in his (studied in crime) mind that it would be investigated but surely not with the vigor of a mass murder. Many murderers make this miscalculation. They underestimate the effort LE and families and the media will go to discover the truth and exact justice.
I will go on record (in the record of my mind) to say that this was a case of intimate partner homicide, the only difference is that one party was entirely unaware of the "partnership", a partnership that existed only in the fantasy world of the other.
I don't know why he brought his phone to Moscow or why he disabled it in some fashion where he did (if it was to create the illusion of an alibi, why not turn it off and leave it at a likely running path and pick it back up there after a fake run, buying time off the grid?) but I do think he felt invisible and invincible. I think he had decades to master stealth. I think he found his white sedan to be as generic as could be, beyond notice.
Hotbed of a college town, crime of passion, LE would be busy looking at every jilted collegiate jock...
IMO that's why he didn't plan better. He didn't think he'd ever be found out. Virtually no connection to the victim.
Virtually. Oh, the irony. Digital trails become runway lights for investigators.
So does leaving DNA behind. The sheath might have been his calling card too, as it appears he wiped it nearly free of DNA. Let LE go down some military wormhole.
Forgive me for venturing into the mind of someone like this, but I think the (ill) logic might have gone something like this: I see her. I find out where she lives. I stalk her. Silently. She has no idea how close I've gotten or even what I may have klepted of hers. She's exactly the kind of girl who thinks she's too good for me. But I can get any girl I want. I'll show her. As well, I'll make her pay. I'll make her pay for all girls. I'll make her pay for all guys too, the idiots who get girls like this.
If he had one target, was in and out in under a minute, hadn't left that whiff of DNA, we might've seen a very different investigative approach, one that may have left him well outside the scope of it for a very, very long time. Long enough that IMO he might've felt slighted by another woman, imagined or otherwise, and somewhere near that campus or another, another headline...
JMO