I think the problem with the "pentagon pilot was too good" theory is that it assumes the pilot did exactly what he was intending to do, that he actually intended to do this maneuver.
Really all he was trying to do was hit the pentagon. He very nearly missed it and ended up short in the ground.
The light poles are indeed good solid evidence it was a plane - but the standard no-plane response to that is that the light poles were "staged" in advance.
Truther mythology can get pretty annoying.
The pilot may not even have been trying to hit the Pentagon. Perhaps he was aiming for the White House. Who knows?