You've nailed it well. Especially that each Bld. 7 floor needed to precisely give way from the top down to avoid the appearance of a planned demolition.

I'd like to add a Fourth issue: No changes to the International Building Codes have been made for high rise structures (60+ floors) in the 20 years since 9/11. A&E professionals worldwide, were apparently able to distinguish BS when they saw it and quietly continued on working as before. So did the insurance people, rates didn't go through the roof. No large building gets built without insurance. High rise construction continues as before.

That 3 building event was so out of our standard reality that it had to be ignored.