rashomon,
Whaaat, after whacking her on the head, garroting her, watching her have a seizure and bleed from her nose, she then decides hey thats enough violence, mmm I doubt it.
Sure and John displays his round table credentials by removing his shirt to wipe away the blood, and deposit forensic evidence, why did Patsy not suggest size-6's instead of size-12's then?
Maybe, since we do not know if John handled the paintbrush handle too, also we do not know where the missing piece of the paintbrush is. Can you see why these items which appear to have no reason for not being present, become more relevant if they link to John rather than Patsy e.g. why would Patsy remove the missing piece of paintbrush yet leave behind the unused piece and her fibers on the used piece, go figure? Why would Patsy redress JonBenet in size-12's, and remove her size-6's then later lie about their location knowing in advance she better have a credible story for JonBenet wearing size-12's, more to figure out?
IMO the staging was intended to hide a sexual assault gone wrong. This is why medical assistance was never called for, this is why the staging reflects an intruder homicide by garroting. The deal was to fake a crime-scene to buy get away time, John Ramsey was prepared to flee airborne interstate that morning.
If the missing piece of the paintbrush eventually turns up as having been inserted inside JonBenet as staging, then the addition of the size-12's destroys this as staging since no intruder knew about those panties, and no intruder would waste time redressing his victim.
So for whomever redressed JonBenet in those size-12's that was a big risk factor so large it blew away any semblence of staging. What would impel John or Patsy to do that, Patsy would know what size-12's on JonBenet would imply. So who took that risk, why was JonBenet dressed in underwear no deviant pedophile would ever consider doing, who would want JonBenet to appear dressed as normal, when the staging required the opposite?