1) The poster's name is einsteen, not Einstein.
2) If we assume, for the moment, the device shown in the swf video is a thermite cutting torch we can look at the following:
Maximum size of the piece of rebar in the demonstration:
Imperial Bar Size|"Soft" Metric Size|Weight (lb⁄ft)|Nominal Diameter (in)|Nominal Diameter (mm)|Nominal Area (in²)
#18 |#57 |13.60 |2.257 |57.33 |4.00
Now, we have to answer the following questions:
1) How much fuel was necessary for the device to cut through a piece of rebar with a maximum area of 4"^2?
2) How much more fuel would be necessary to cut through the columns in the WTC?
3) Can the device be implemented in such a manner as to move around the exterior of the column, or can it be made large enough to cut through the column w/o moving?
4) What would the approx. size of the final device be?
5) What debris from such a device look like? Would it be recognizable in the debris from the tower?
6) What other evidence would the device leave?