WTC Pulverization

Just saw this old post-- and had a new thought. Bazant:
"only about 7% of the total gravitational energy converted to kinetic energy of impacts would have sufficed to pulverize all the concrete slabs and core walls (while at least 158 tons of TNT per tower, installed into many small holes drilled into each concrete floor slab and core wall, would have been needed to produce the same degree of pulverization)."
Wouldn't 7% of that gravitational energy be from the concrete floors and core walls-- the very things that are being crushed during the "collapse"? If each floor is getting pulverized during the "collapse", then this mass would go out as dust, and not contribute to the total gravitational energy. Thus, the official total gravitational energy calculation is a huge lie.

There are many many other problems with Bazant's work, as I have described before. I've been meaning to write a more thorough critique of his stuff but ran into various issues. Long story.