re your…”supports would have to remain standing unless there was demolition to bring them down.”
So, what you are saying, the aircraft could not possibly destroy the buildings. That a professional crew, possibly 10-20 men, did all the engineering and preparation in strategic areas of the center structure, (at night) and then waited nearby, for days? Until each building was struck, by aircraft, and then soon after “threw the switch”? To cause the collapse?