The right wing could not have went over the generator and caused damage to the bottom floor. The fuselage should have also hit the cable reels.
How many projectiles were there? I see 3-4 distinct holes in the interior wall. Some of these holes were supposedly opened to "clean out" the debris. Though there are fire marks on the wall, so the blast must have pushed them open.
I see no structural connection here broken. some wire, and plumbing, but no broken concrete connecting the "Wedge" to the rest of the building. Notice on the top floor the computer monitor on the file cabinet which were untouched.
The Cable Spools or Reels topic, has been brought up before, but lets take a close look at where the plane should have hit. The circle in black shows the impact point. The planes nose did not go above the second floors ceiling, we know this from pre-colapse pics. Therefore the wings would have hanged lower, coming in at an angle, the plane should have "landed" right on these spools. The explosion of the plane was enough to disintegrate a 757, but left the cable reels in pristine condition.
Below shows a pic before firefighters sprayed foam on the reels. They look in pretty good shape. All 5 reels are here, (there is one in the bottom left corner). The upside down "Y" of wire hanging above the cable spools indicates the point of imapact. How could the plane do so much damage to the bottom floor, but not even touch the cable reels?
This gives you an idea of how large the engine is for a 757.
The damaged structural columns appear to be pushed OUT, not IN as one would expect if a wing had done this damage. What pushed these structures OUTWARD ?