Thank you, but I sense that RDI feels no great urgency to explain this DNA, as if it were random. That almost makes sense (as an RDI-biased choice) if the DNA was found in just one spot. Now that the DNA is matching three (3) or more locations, random explanation is no longer valid, and a nonrandom explanation IS REQUIRED.
That is, RDI can't claim random, provide vague explanation, and maintain credibility.
Either RDI has to ad hominem the results (e.g. the DNA doesn't really match, lab mixup, or the unknown male DNA is actually JR and PR DNA mixed together) or RDI has to accept three (3) locations as nonrandom.
If the three (3) location matching DNA is nonrandom, then a nonrandom explanation is required as to how the DNA got there.
The best fit scenario seems to be JBR's untested playmate's DNA transfered by JBR's own hand without also depositing JBR's own DNA, having collected this DNA from unknown source. Relies on cynic's assertion that a person can deposit someone elses touch DNA while not depositing their own touch DNAthree times in succession [source requested].
Further, I would point out that while we don't factually know that JBR ever raised or lowered her long johns or handled the inside crotch area of her underwear, we can easily infer that someone besides JBR did each of these during the commission of a crime.
RDI seems to be accepting the idea that PR, JR, or JBR handled JBR's longjohns and inside crotch area of her underwear without leaving their own DNA, but instead left the DNA from someone else. Somebody not on the list of DNA-tested people.
I might buy into this if it were one spot, but three spots is far too remote. The DNA was deposited by direct transfer from JBR's attacker. Thats the best, most likely answer.