Yep, it takes a structural engineer to check passenger manifests. It's for the same reasons you need a policeman to help you cross the street.
So there weren't any Muslim names on the passenger lists... and yet the lists jive with the passengers. The numbers don't match either, on each plane.
No biggie, why worry.
Here's more, the plane hits at a rolled-to-the-side angle, the building has thick concrete floor slabs ... this is essential to the "pancaking" theory... that would be like hitting a sewer grate, what was expelled out the other side of the building? Remember they found an intact engine a few blocks away, does it really fit between floors? Maybe WTC workers were really tall and needed lots of headroom?