I don't find the contention reasonable. The 767 was better than 3x heavier than the Gulfstream so what might take off the wing of the Gulfstream is not necessarily sufficient to do that to a 767. There so I disagree with you on that issue.
As far as Hanjour is concerned, as I recall the pilot who checked him out (for renting the Cessna) said his flight skills were poor but didn't doubt that he could have flown the 767 into the Pentagon.
Since I don't find the inference that the 767 should have lost a wing reasonable, it is moot whether Hanjour had the skill to fly or control the 767 in that configuration. I would note that if the [whole] wing was completely sheared off (as a facial reading of your post would imply) that is a non-survivable situation (IMO) regardless of the skill of the pilot. Even if the Gulfstream had been at altitude, it would remain a non-survivable situation.
As far as Hanjour is concerned, as I recall the pilot who checked him out (for renting the Cessna) said his flight skills were poor but didn't doubt that he could have flown the 767 into the Pentagon.
Since I don't find the inference that the 767 should have lost a wing reasonable, it is moot whether Hanjour had the skill to fly or control the 767 in that configuration. I would note that if the [whole] wing was completely sheared off (as a facial reading of your post would imply) that is a non-survivable situation (IMO) regardless of the skill of the pilot. Even if the Gulfstream had been at altitude, it would remain a non-survivable situation.