It seems fibers are important to RDI theory.
Quite so. In the book, I spend a fairly large amount of time on them.
It seems RDI believes the fibers carry more weight than the DNA.
I can't speak for other people, but this RDI believes that. I have my reasons.
Who says JR's fibers were on the tape? What is your source?
Sorry about that. I should have been more specific. JR's fibers, to my knowledge, were not on the tape. PR's were.
How does this source know the fibers belong to JR?
Well, of the fibers that were found that are attributed to him, the shirt was made in Israel, so it was fairly distinctive.
Do the fibers contain DNA or something?
Are you speaking in general?
Was a spectrographic analysis performed? By whom? Where are the results?
If memory serves, there was a spectrographic analysis mentioned, but I couldn't say by whom.
[*]Why wouldn't fibers transfer from JR and PR --> JBR's clothing --> intruder --> tape or cord?
That's a good question. They're all good, actually. But as I've mentioned in the past, JB's clothing didn't have those fibers all over it. Just those areas. Which suggests to me that those items came into direct contact with the clothing worn by the two parents. Moreover, when asked as to how her fibers got onto those items, PR didn't give any of the explanations that you offer. Instead, she admitted that they were hers and tried to account for them with a story that just dug her deeper. (AFTER she had two years to think about the answer)
[*]Does JR's fiber on the tape prove ownership?
PR's fibers. And alone you would have a time proving ownership. But as I've often pointed out, in this case very few things should be taken alone. If it was a used piece--and there's reason to think that it was--then it becomes a question of why would an intruder bring a used piece of tape, or did he search the house until he found one?
Anyway, wouldn't it have been better for RDI if the DNA were owned by an R, and not an unknown male?
HOTYH, if there's one hallmark of our relationship, it's that we've always been honest with each other. You've asked some good, solid questions and you seem to be making an honest attempt to better understand RDI mindset (this one, at any rate). So the very least I can do is give you an honest answer. I can say honestly and unequivocally, yes it would. On a couple of levels. One, if it were semen or even blood, the kind of DNA you should not find on JB, it would pretty much be a lead-pipe cinch. Two, even if it wasn't incriminating DNA, it still wouldn't leave much room for doubt.
But, I would also say that, in murder as in life, we very rarely get everything we want and that often skill, cunning and pure cojones can make up for weaknesses in the physical case. But then, you're not the one who needed to be told that. Also, it must be proven that the DNA is from the crime itself and from that night. It's not a straight shot from "unknown male" to "intruder." Far from it.