None of this addresses the impossibility of any mass falling through steel at the same speed as it falls through air. Picking out questions that don't seem to make sense to you at first doesn't change the laws of physics, or the impossibility of the official story.
As for wiring,
Tom Sullivan of Controlled Demolitioms Inc., which did some clean-up work at the WTC, says this:
Now isn't it a coincidence that Marvin Bush, George's little brother, was on the board of the company which had the security contract for the entire WTC. That means access to any part of the building night and day, floor plans, and control over the security cameras.
HistoryCommons.org
Here is another part of the interview
with demolition expert Tom Sullivan:
So the bottom line is you don't need cords all over the place anymore. As for people walking their dogs at night and not noticing people going in and out of the towers, you must be from a small town. NYC isn't like that. It's the city that never sleeps and the WTC complex is like a small city unto itself, with trucks going in and out multiple entrances across a square mile into underground garages, NYC traffic everywhere. Nobody cares or asks what anybody else is doing. The Towers held 30,000 workers. That's a lot of maintenance crews, food for the cafeterias and restaurants, office supplies, contractors for one thing or another, round-the-clock computer workers and what all. If you think it would be hard to do the wiring work unnoticed you don't understand the Big Apple.
Marvin Bush:
9/11 Security Courtesy of Marvin Bush