It seems you haven't understood the difference between controlled demolition, CD, and a one-way crush down of A by a piece C of A being dropped by gravity.
In CD you destroy plenty of supports in the building by various means in a controlled fashion - normally at the lower parts, e.g. WTC 7; in the WTC 1, 2 cases is was done from top down.
Reason for this is that you cannot crush down the building A by dropping a part C of A on it. NIST of course suggets otherwise. PE > SE = global collapse ensues (no CD required). NIST is like the AIG insurance sales people! Selling insurance with no capital to back up the risks and running away with the premium.
Tell us why every demolition expert in the world rejects the idiocy you peddle.