I have not read the previous page and apologies if already mentioned but the other factor with US 'precision' bombing that mostly gets overlooked is that when the US air forces really got into their stride with large formation bombing in europe - only the Formation 'Lead' and 'Deputy Lead' (if required) would be using a bomb sight on the aiming point,the other aircraft would just 'toggle' when they saw 'Lead' drop.The toggling was done either by the a/c Bombardier (if carried) or by an NCO gunner trained to be a 'Togglier'.When you look at the size of the formations - the bomb 'spread' would sure have needed a large pickle barrel !
Of course when the target weather was overcast - the toggling was initiated by using 'Mickey' radar sets (H2X).