Here ya go PS, take a look at the Windsor tower photo again. You can see in the aftermath and during the fire that the steel structure was collapsing. Since the Windsor building has a solid reinforced concrete core and the fire was on top, it didn’t drive into the ground.
The WTC, the fire and impact was about the 80th floor. Now imagine if the 80-85 floors heated and twisted like the top of the Windsor building did in the after picture on Wikipedia, however, unlike Windsor, WTC had another 20 floors on top.
