Because she left more than "a couple of prints". She left blood and hair. A hair with a root was in the MH bathroom sink.
Also her hair in his house.
I take the fiber evidence seriously. The orange fibers are not a common type. She had one of those, plus the blue fibers. Some of the fibers (orange) were in his bed. All laundry had the orange and blue. Then the fibers in the MH and finally in the SUV. Her carpet fibers in the MH.
Recent haircut and no hair found of hers longer than before the haircut.
Finally DW's strange behavior and his collection of child porn.
Almost forgot the blood on the jacket.
My first impression is to ask 'Where in the hell did you pull that from?'
But I will be polite and ask "What testimony points to that statement? If I recall the correctly no one know what the source of the orange fibers are."