It's about looking at the evidence, PorkShillAssHat.<quoted text>And there's the part that requires qualification.
There's no reasoning that supports it and in fact, it's complete and utter bunk.
The interior of the building collapsed leaving the more rigid shell standing until it could no longer support itself against the forces being imparted on it from the interior collapse...which is witnessed by the collapses of both the penthouses followed by a kink off center to the east then breaking windows followed by global collapse.
Sunder obviously knows worlds more about structures than you do sockie and he does no such thing as debunk himself.
That "rigid shell" you mention is constructed of very strong steel columns that require lots of energy to buckle and deform... or, much more likely, cut. But if the entire perimeter is dropping simultaneously at free fall, as the videos show, then that energy isn't coming from the gravitational potential of the columns themselves.