Chugalug
Human hearing is very sensitive to changes in sound.
The lighthouse keeper was a rotorwing enthusiast and had done some light a/c flying, as I understand. He seemed quite sure that there was no change in sound, that they went straight in.
When you watch a helicopter manoeuvre, you will surely note that it can't change much in terms of aspect, power, anything really without your ears picking up the changes in sound.
Are you suggesting that a control jam in a Chinook could have caused a turn (onto a heading that the HP just happened to have set) and allow an unstable a/c to fly over that last leg (waypoint change to impact, a significant length in such an emergency) without any audible sign of the pilot trying to regain control? Fantasy.