Comment: well

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First - #1 is not true at all, Steel acts as a thermal conductor and radiates heat away from its source. The concrete also does so in a smaller way. The more steel involved in a structure the less it is effect by fires.

The 2nd point is also false due to the nature of steels thermal properties. Also due to fuel burn off this includes the plane fuel and fuel found in the office. It will burn of expand the starve behind the advancing flame. The heat will be most intense at its advancing front and just behind it briefly then quickly drop off as it is radiated through the steel and concrete. This is nothing like a blast furnace where the flame is fully contained and fuel is continually introduce to one location. Which is what would be needed to produce the scenario you mention in #2.

To further compound the issue at hand a global symmetrical collapse would require that same blast furnace scenario at each and every support column at the same time. Even then symmetrical collapse on one floor or even ten or twenty would not be enough to destroy even a few of the floors it impacted on. Worst case scenario is the top 20 floor fall into the lower 80 crush 1-3 come to a sudden halt then either stop or tip to one side and continue to the ground leaving the 80 lower standing.

The Abuse of Greatness is when it disjoins remorse from power. - Shakespeare