From your link:
"Everything vaporized on impact," Miller said.
That's a crock. Aircraft US427 went in outside of Pittsburgh, there was debris everywhere. It turns into a zillion tiny metal razor blades on impact. Everything gets ground up, some of the largest items were fingers, feet, shoe, etc. They dug up the cockpit in nine feet of dirt and both engines at twenty one, give or take. Shanksville went in similar to 427. And for some odd reason, Shanksville was dozed into the ground pretty quickly.