[Dean]

No matter what I say, I'm pretty sure you will pick on something else. So choose to believe what you will.

As I said, the pancake progresses in both directions once the collapse starts, so no, the top should not hit still intact.

Puffs of smoke and dust are mostly indistinguishable on crappy low res video. And the later can be explained by just about anything related to stress and failure, escaping air, etc...

Witnesses are unreliable. "Explosions" are indistinguishable from very loud noises of other types, and nearly impossible to determine original source due to the limitations of the human ears, and the ease in which sound can be transmitted through different materials over great distances.

I'm not even going to start the Pentagon discussion.