Not to mention the scores of firefighters that stated they heard the building creaking, moaning, and actually shifting before the zone was established.
Just the thought that they could pull this off is ridiculous on so many levels. The requirements are extreme.
To rig the building in advance you would have to know if WTC 1 was going to hit WTC 7 before you CD'd WTC 1. I don't know, someone confirm for me, if the demolition charges in WTC 7 can be shaken loose, but I would imagine if they can be, an enormous amount of debris hitting the building would be able to do it. Not to mention Jennings stating that the build shook several times while they were evacuating. So we run into the same issue of "would the explosives live through the ensuing chaos" issue.
In another scenario, you plan for WTC1 to hit WTC7 and then go in to prepare the demo. Then you run into the problem of having thousands of people, several TV stations (including international), and photographers on scene wondering why people are running in and out of building 7, then it falls down. On top of it being, literally, impossible under the circumstances.
When it comes to the steel, twoofers make it sound like as soon as it leaves the US, no matter the circumstances, then no one would notice anything. When it arrives at the ports for recycling, the people in that country unloading it wouldn't comment on how it looks? I am assuming the plants the steel went to in order to be recycled would have a few people that know something about the appearance of steel after a demo. Not to mention, considering the scale of coverage, most people at the recycling plant would be waiting to see the steel.
All of this adds up to no one caring what Silverstein said. Hell, he could have said he did it straight up, but everything else points to that being BS.