The construction of the WTC towers was different than most buildings. When one floor went, it was a given that others would follow, and a complete collapse would likely result.
I'm willing to listen to just about any theory, but in this instance I believe the postulator is not only wrong, but it tragicly feeds the mindset that Moslems didn't do this, we (or some unseen force) did.
Nonsense!
Only for complete knuckleheads who want to believe anything but the obvious due to personal problems.