Massive things fall at the same speed as light things - were it not for air resistance. That tower dropped as swiftly as a ping-pong ball if you like. Remember Galileo?Sorry but massive things are alot slower than lightning
The transferred loadings would have moved around the structure at the speed of sound in steel, which is about 5 miles per second. That is similar to the speed of lightning.
Of course we agree on that. WTC2 fell at about 0.7 G, or 22.5 feet per second per second, WTC1 started lighter and had further to go, and recorded 0.64 G, or 20.6 feet per second per second.It doesn't matter if the intact structure stops the upper one or not - it most definitely has to impede its progress somewhat. Can we agree on that much?