Based on the short lenght (2 mm, or about 1/12 of an inch) of the fiber, and the color. I suspect that the fiber is from a car floormat since that type of carpeting has a very short nap, and dirt and foot wear would easily cause it to abraid. One would think if the carpeting in the driver's portion of the MH was a match for the blue-gray fibers, the prosecutor would have mentioned it before now.
I don't recall the prosecutor stating the source of the blue-grey fibers. Could have come from a number of places, even Dad's bar. If the VDs have/had a vehicle with blue-gray carpet, that would explain why similar fibers could be found in the DW residence.
Until the prosecutor explains the source of such short blue-gray fibers, the damage to Westerfield, while not helpful, is not too bad.
Or if the blue-gray fibers matched (police undercover cars, or any of the Van Dam's vehicles, or. or. or. BUT NO, they didn't check).