TeaTime,
JR's fibers are on the size-12's and JonBenet's groin? I know its not a smoking gun, but they should not be there.
So you give BR a pass due to his age. How about Patsy staging for Burke Ramsey, this would explain her forensics in the wine-cellar, and all her cover stories for Burke?
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No one gets a pass. But PR's fibers entwined IN the cording and in the paint tray are impossible to explain except that she handled that cord and paint tray (fibers likely fell while getting the paintbrush) while wearing the jacket she was wearing that night. She is entwined in one of the murder weapons. For this reason a jury could reasonably conclude that she applied the cording which killed JBR. Especially since she claimed to have no knowledge of where that cording came from.
JR's fibers could be from him helping to change JBR's clothes although neither parent seems to remember who did what or what the child was dressed in for bed. It puts his clothing touching the child or brushing against the big panties and transferring to her body but it is reasonably explained away. No jury would conclude he was involved in the murder from this evidence alone.
BR's DNA on the nightgown which allegedly just came out of the dryer and was found near the body can't be explained except that he touched it after it was laundered a day or 2 before the murder. By the looks of the bed, it does not appear that a blanket was removed from under the comforter that night and it is most likely that it was still in the dryer when they got home from the White's party. His DNA at the crime scene on the nightie is not reasonably explained away unless one argues that he folded the laundry all the time. No one claims to have touched that blanket or nightie. DNA doesn't lie.
A jury could reasonably infer from BR's prints on the pineapple, his boot print near the body and his DNA on the nightie near the body that he was involved with the injuries to JBR or even her death.
A jury could reasonably conclude that the only way a mother like PR would strangle her own child is if she thought the child had just been molested and bashed in her head by her brother and that the injuries and exposure of same would be fatal to her family in every way imaginable. OR that she thought the child was already dead and staged it for the reasons above.
This is my opinion.
An unreasonable theory involves a sexual sadist, mystery intruder who left no trace of self behind and did not brutally rape the child as one would expect of a sexual sadist that preys on children. HINT: they don't insert little art brushes into the vagina a little bit.
I completely disregard the 6 different DNA types found on the panties because I refuse to be made to believe that SIX mystery intruders were involved and instead I accept the most reasonable explanation which is that this mystery DNA was from manufacture and processing.
Just My Most Humble Opinion based on everything I know about this case.