If you read in PMPT that there were two different, distinct DNA samples obtained from the panties you better provide a quote and a page number because I think you are mistaken and as such are spreading false information. There were two blood spots, yes, but not two DNA samples.
"The CBI had already determined that the stain on JonBenét’s underpants—which appeared to be blood and turned out indeed to be blood—was not solely hers. A D1S80 DNA test showed that the stain came from at least two different sources." - Perfect Murder Perfect Town
This exactly three paragraphs after part two, the hatfields and the mccoys. I have this on EBook format and as such there are no page numbers.
Maybe they mean JB and 1 other person. That's possible! I don't have the Kolar book yet, I just read passages where I can online. Someone summed up his writing on the DNA evidence on this forum discussion: http://www.forumsforjustice.org/for...NA-revisited-in-light-of-James-Kolar%92s-book
According to this thread, which I found really helpful and a good overview, the DNA evidence comes from at least six unique people, excluding JB, and other Ramseys since they live in the house so it'd be everywhere anyway. I think the presence of six distinct profiles, small as they were, is proof enough that there are so many explanations for DNA. Also this forum link discusses the accuracy of the saliva test on the one sample. Basically it's up for debate on how sure they are that saliva enzymes were actually present, and how the test can produce false positives.
I am sorry about asking for non-DNA evidence - I saw you posted that before and I missed this post. I see it now. Not sure if this is the best evidence honestly.
Fibers and animal hairs are so easily transferred. Anyone with a cat for example can attest to their hair getting stuck to your clothes. Any guest at any time while they lived in the house could have brought in unique fibers and animal hair.
The idea that the R's couldn't have done a thing like this is just an opinion. We have no idea what people are capable of when it comes down to it.
The behaviour of the R's after the crime is evidence against them. They failed to work with the police and keep getting caught telling lies. For example, since we're on the subject of panties, PR kept saying she put those too-big-panties in JB's panty drawer. But investigators on the scene only found her regular size in there.
As for the ransom note, it matches almost exactly PR's handwriting. Also, after being 'under an umbrella of suspicion' PR reportedly changed the way she wrote the lowercase "a" and she changed her phrasing, styles, indentations, etc. None of the other R's did this.
Some behaviour does seem to fit IDI, though. PR was reportedly pointing out the flaws in the ransom note. For example she commented that John wasn't even from the south. I think this is interesting. It could be her trying to cover her tracks though. Especially if she realized how dumb the note was after seeing the cops look at it strangely.
Edit: Let me throw in the quote I most recently read which led me to believe (maybe wrongly) that the DNA in the panties was from two people that weren't JB.
"Further confounding the experts was the stain found on JonBenét’s panties, which was a mixture of DNA from two or more people. Here further testing was needed. The detectives were advised to take saliva swabs from possible suspects. The list of people to be tested in connection with the mixed DNA was long and included many of JonBenét’s playmates. If a match could be found, it might provide a simple explanation—for example, two children sharing the same underwear. In that case, an important door would be closed in the case: No defense attorney would be able to claim that the unidentified DNA found on the panties belonged to a unknown person—an intruder or stranger who might have killed JonBenét." - Perfect Murder Perfect Town, Chapter 30. (Bolding mine)