That hypothesis is falsified by the lighting and shading on the police car in the Pentagon video that I already pointed out. The brightness of lighting and shading on Flight 77 debris matches that on the police car, which has a similar tone. Both examples show that self-shading does not make a light-toned object appear black in shading.
The problem is, the police car may be receiving fill-in light from some object(s) or surface(s), such as the lighted concrete or the security booth structures. I'm reasonably certain you can't just assume they would look similar in this case. Possibly Jay or someone else with a better understanding of this could comment.
You're only proving what you assume: if the dark object is the vertical stabilizer, then it's not a lamp post. But that proves nothing. On the other hand, if the object identified by the ASCE report (see page 13) as Flight 77 is F77 as I also contend, then it is about 100 feet further back, closer to the last lamp.
Possibly you have missed the point I intended to illustrate by including the security-camera view of the model. As you can see from the positions of the traffic cones, the gate, the gate controls, and the Pentagon itself, this view is correctly aligned. Therefore, there is
something in the video at the position of the aircraft's horizontal stablizer in the model. I have demonstrated that this cannot be the light pole.
However, a problem I see for the lamp theory I broached is that the dark spot is probably too high (unless the impacted lamp was thrown upwards).
Actually, from the measurements I made, the tops of the light poles are about the right height.
But this is even beside the point. The dark object not only has nocontrary attributes (ie, is black when the aircraft would be bright. Note too that if you attached a fuselage to the alleged and mysteriously dark vertical stabilizer, we should be seeing it slightly above the foreground box, but we do not). So it doesn't even matter what it is, since we know what it is not. ~Ian
Another issue I believe you have failed to consider is that the object appears to be somewhat blurred, either due to its being out of focus or due to its rapid movement (or both). Also, as again illustrated by the security camera view of the model, the majority of the fuselage would be masked by the gate control.