Surely he had more than one murder weapon. Back up. In case things go awry, right?
I'm trying to understand a thought process where he thinks one knife in one hand and the sheath in the other is a solid game plan.
Why wasn't that sheath secured?
Possible explanations:
1. It was. But it came loose.
2. It was a calling card he intended to leave behind. I wonder of its placement lends itself to one theory or another. Does it look somehow like it was lost in the slaughter or left with purpose?
3. Killer was overconfident. Lost control of the situation and his sheath.
Assuming he left it there accidentally, what was his plan for not leaving it behind?
If he left it purposefully, hoping to become the feared Marine Murderer or somesuch, was it left where it was as part of a one-two, practiced ninja maneuver? Slip the knife from the sheath, slide it under the body, stab/slice the victim, all part of one vicious move?
Except for the missed DNA, this would have been a very different crime IMO if KG (and Murphy) hadn't been there and XK hadn't been awake, two (three) things I think BK missed in his reconnaissance.
Without them, DM would not have been alerted. There'd be no eye witness, no independent time stamping, no vehicle speeding away. And possibly no sheath accidentally left behind.
One victim, murdered in bed, with militaryesque precision.
Who knows what would follow. BK moves to another community with a sister city and another coed falls to the knife. Serial killer takes form....
Instead BK fails at his first attempt. Sloppy massacre, mass murderer because he lost control of his own narrative. A reactive mess, leaving a trail of victims because he hadn't factored for the unforeseen.
Just one more thing BK bottoms out of.
JMO