Mick... the people at NIST themselves after much gymnastics admitted free-fall was in play for at least part of the collapse of WTC7.
Free-fall means zero structural resistance.
Fires possibly weakening local parts of the steel structure can't be responsible for sudden total structural failure no matter how much pimped 3D models NIST produces.
There had to be other forces at play responsible for the sudden total failure of the building's structural integrity.
Very true, if there was a "sudden total failure"
Are you at all familiar with what happened to the Penthouse? At what point after the "sudden total failure" began did the penthouse fall?