Do you have any idea what is involved in setting up an actual controlled demolition? If it were a controlled demolition, someone living in the building, and yes there were enough survivors to have seen the preparation work, would have seen workers boring holes into the concrete pillars, using plasma cutters to cut into steel support beams, and placing the explosives, not only at the base but at several key points stories up and running all the wiring.
You may want to read this:
https://science.howstuffworks.com/engineering/structural/building-implosion.htm
Or watch this (for what it is worth Controlled Demolition out of Phoenix Maryland are the recognized world experts in controlled demolitions).
Miami Resort | Building Demolition | BlowDown | S01 E03| Free Documentary
You actually think they did it during the day? Explosives don’t need to be inserted, they (such as C4, nanothermite, etc.) can just be put on beams, etc.
Also, steel beams do not just implode/flatten without an explosive. Some or all of the beams should have been left partially or fully standing if no explosives had been used.