Not at this juncture no. I would rather explore the potential of not considering the outside walls to be infinitely strong. Perhaps it is that difference in the models that accounts for the disparity in the outputs, in part at least ?
So now you think that when the fire heated the beams and the girders they all expanded at more or less the same rate, and they pushed the columns around, so there was no displacement at any of the connections? What's the largest displacement between adjacent parts in this diagram
C79 is in the middle of the 1.47 to 2.03 band, and says it moved 1.85 east, 0.94 North (or maybe sourth).
But it ALSO means that the beams and the girders and the slab all moved smoothly with it. That makes zero sense.
(EDIT) and means the comparison to the NIST 5.5" figure is meaningless.