I remember climbing the mound for the bucket brigade and thinking the same thing myself as I worked toward the center of the pile. There was office equipment still left and things like small refrigerators that were pass down the line but for what was there, we are only talking about maybe 3 percent of what stood there at best. Jet fuel would have burnt most papers. Thermite, dew weapons, microwaves, and tactical nukes orchestration is what I believed best explains it.