This is the portion I found especially intriguing:

Furthermore, post shock subsidence of the signature effect is arrested and "frozen" in place if death occurs within minutes of a well developed signature response. We believe this latter effect has not yet been reported.

In other words, comparing the marks from a living person to those on someone who died after being stunned, is not accurate since the deceased's body functions are halted. Thus, the marks remain on a corpse and are diminished (healed) on a live person.

I've been saying that for eons!

Anyone ever see 'snaps' or 'buttons' with miniture boats engraved in them? Snaps or buttons that could cause that kind of abrasion?

Normally when marks such as Spitz refers to are found on a body after death, they are impressed (indentations) into the flesh, not abraded into the skin. Sometimes a killer will deposit a victim in the trunk of a car and the body, resting against some object (in one case a discarded license plate) takes on the impression of that object. The killers of some hit-and-run victims have been caught when the impression of their vehicles grillwork has been found on the deceased. Those indentations in the skin do not turn dark brown to purple because the victim dies and blood flow stops at that time. The marks on JonBenet were made with enough time prior to her death for them to become engorged with blood but not soon enough for the body's circulation to 'erase' the damage.

Rainsong