Plane crash experts, Am I right or wrong about this?

The forces involved in this crash were mive, the 757 was going close to the speed of sound and it hit reinforced concrete. It is fairly common knowledge that remains from people sat at the back of the plane due to the hijacking were located further into the pentagon than the hijackers sat at the front of the aircraft which shows how much destructive power for the planes *** to come through the front in the impact, atomised pretty much, so no large chunks of wreckage...