This one looks great! Kudos to whoever created it. One of the better images I've seen…
Ummm…the lower floors, fully intact and undamaged, were supporting the upper floors just fine up until then. Are you saying that motion adds mass to such a degree that the lower floors suddenly failed in succession? That would be a novel way to save on blasting materials when completely demolishing buildings. And simply does not explain complete lack of metal wreckage.
No steel beams. No rebar. 50,000 steel filing cabinets, of which precisely ONE was found in the ashes. Operative word: ASHES.
Go study more, Anon.