Whilst I agree with a lot that Twos in has said, I also wonder if the system ever considered the 'fear factor'? Young fledglings can sometimes be intimidated by the demi god sitting next to them in the cockpit and never get to show their potential. Fighter Pilot briefly showed a snap shot of a bollocking in the air and I knew how the poor bugger felt. It knocks the old enthusiasm out of you. Ok it was a long time ago, but Guy Gibson once took a number of Sergeant pilots up with a view to having one as his co pilot. He dismissed them all as useless, until he ended up with Dave Shannon. Shannon's view was that the Sergeants weren't useless, just that they were scared of Gibson.