So if I understand what you are suggesting you think it is more likely that PR fibers were transferred to JR or something/someone, and then from him or that person/thing to JBR. And you find that more likely than a primary transfer from PR to JBR?
Patsys fibers were found in four places relating to the crime scene, not just the victim. JR must have been covered in PR fibers in order to get more of PR on the body than himself.
PR fibers were found:
1. in the paint tray
2. tied
into the ligature found on JonBenet's neck
3. found on the blanket she was wrapped in
4. found on the duct tape that was found on the mouth
http://www.fbi.gov/about-us/lab/forensic-science-communications/fsc/july2000/deedric3.htm
Fiber Number
The number of fibers on the clothing of a victim identified as matching the clothing of a suspect is important in determining actual contact. The greater the number of fibers, the more likely that contact actually occurred between these individuals.
Fiber Location
Where fibers are found also affects the value placed on a particular fiber association. The location of fibers on different areas of the body or on specific items at the crime scene influences the significance of the fiber association.
snip
A primary transfer occurs when a fiber is transferred from a fabric directly onto a victim's clothing,
whereas a secondary transfer occurs when already transferred fibers on the clothing of a suspect transfer to the clothing of a victim.
http://www.acandyrose.com/crimescene-evidence.htm
Bruce Levin : (Atlanta meeting taped August 29, 2000 9:34am) "We believe the fibers from her jacket were found in the paint tray, found tied into the ligature found on JonBenet's neck, was found on the blanket she was wrapped in, was found on the duct tape that was found on the mouth.
I have no evidence from any scientist that suggest that those fibers are from any source other than your red jacket."