Jimbenarm and Apollo made good points about the dust, but you seem to be getting close to making an actual CD hypothesis, I like it. I don't think any truthers have done that.
So how would you blow up a building floor by floor in a top down demolition?
you have the added hurdles of:
BLBG demonstrating that it would take 158 tons of TNT per tower, drilled into small holes the concrete floor slabs to produce the concrete pulverization observed.
Columns ejected 500 feet, there is some discussion of that in a number of posts on
this thread, but it is by no means conclusive.
large portions of the core remaining standing after the collapse front reaches the ground.
I'm quite interested in how a CD hypothesis holds from a metatheoretical standpoint, especially since no truther has offered a coherent hypothesis with quantifiable data.