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Additionally, perhaps we can read into the PCA.
I picture something like this:
The perpetrator has taken measures to minimize leaving DNA at the scene. Coverall, mask, gloves, shoes.
I suspect he also took measures to prevent blood spatter. IMO K may have been killed simply because she was right there, in M's bed (if M was the singilar target, as I think). X and E, victims for having been awake, and I fear that room was especially bloody. Try though he would have not to, I think he did step in blood, but that his footfalls stamped less blood quite quickly, well before D's door.
IMO the additional testing lit up footprints leading to her door and perhaps beyond.
It's the convergence that's most compelling and why IMO that single footprint is included in the PCA. It reinforces D's credibility, and I think we'll come to find that he was walking very stoicly. Even footfalls, perhaps even pausing here or there.
Without that footprint, maybe D did or didn't see anyone. Maybe she saw someone nearer or farther away. Maybe it was at such a distance as to make it more an impression than a sighting.
Except for the footprint.
The footprint places him right outside her door.
Exactly where she said she saw him.
D becomes an ear witness, a time stamper, and an eye witness, describing someone who, not only doesn't exclude BK, it is a striking match up.
Chilling.
JMO
Another tidbit I recall from the book is the description (sorry, graphic) of how much of the blood may have soaked into the mattress on the 3rd floor and perhaps on X's bed. E it seems may have been killed in the doorway or just inside the bedroom, but presumably not on the bed.
There was sad mention in the book of how it may have been the case that not all the deaths were immediate, possibly suggesting X may have been on the bed when the attack began but may have moved herself to the floor to be nearer E.
Anyway what I'm thinking is that other than splashes or drips, I think it's possible that only E's killing produced a large amount of blood on the floor immediately and available to be stepped in by the killer.
Again, all MOO