The jacket wouldn't need to have been worn in the basement for those fibers to end up in the basement. It's enough that they could have been transferred to JBR, then from the killer to the various objects.
Consider that it's possible that PR is the killer, molester, paintbrush jabber, wiper, redresser, etc. The red fibers, from the jacket, could still be in those locations from secondary (indirect transfer) That is, the fibers could have been on JBR and transferred by the killer (PR in this example) to the rope, blanket, tape, etc.
Recognizing that the fiber evidence is inconclusive does not weaken a PDI theory, or any other theory. It's just that the fiber evidence doesn't particularly support one theory over another.
Respectfully, you are entitled to your own feelings as to what is plausible, but there is nothing in the forensics of fiber transfer which would make secondary transfer unlikely.
IIRC there were four red fibers on the tape. You've always struck me as sensible so I know you aren't suggesting that the fourth fiber is the deal breaker.
The tape was pulled off the mouth and allowed to drop to the floor, so we don't know if the fibers were picked up from the floor or not.
The fibers "ENTWINED" (Let's go for maximum effect) in the rope (let's be specific, in the knots) could have been transferred from the body to the rope by the killer's hands (and it could still be PR) The knots are where the fibers would most likely be found because A) the hands/fingers are busiest at the knots, and B) fibers along the rest of the rope will tend to fall off, rather than be secured by the knots.
Those, iirc, would be JR's black shirt fibers, which is another issue. Though, imo, also inconclusive. We can discuss that particular evidence another time, if you care to.
I think that makes a good deal of sense.
I can also see it meaning he redressed her. Though I think overall, even that fiber evidence is inconclusive.
Lastly, consider this. PR knows well in advance what questions will be asked at the police interviews. She knows fiber evidence will be an issue. If she wanted a convenient explanation for her red jacket fibers being in the basement why wouldn't she simply say she'd been down there, with the jacket on? It would be virtually impossible to fact check this, so she'd have nothing to loose, and something to gain.
Her statement that she wasn't down there the 25th must either be true, or be a lie that doesn't get her any mileage. If she is going to lie, why not an effective lie?
Chris, you did read the part about "possibility vs probability" didn't you? And insinuating that my opinion is based on "feelings" is, well, getting a bit desperate or condescending?
Your idea is possible and I've never said it wasn't. I see my view of the fiber evidence as probable. We can agree to disagree.