Sorry to be morbid – but I would think a wood chipper would spray evidence all over and would be impossible to clean up – so maybe it’s not surprising he didn’t go that route. But yeah, if he did, there’s no way he could’ve cleaned it completely. Too big with too many deep moving parts.
Yes there probably would have been dna evidence all over the place had it been used. At least that disturbing idea is off the table. Too bad everything else is did is just as disturbing.