The calculations I was basing my math on were actually Greening's, if I recall correctly. He calculates for the upper block falling through one storey. This is because the upper block must have had to fall through at least one storey. It probably fell more, in reality.
Bazant's model may be more accurate in this respect, as it has been so far, but I would have to check that again.
Well, you can't have it both ways. Why were Bazant and Greening not able to view the visual evidence?