The RAF didn't fly in formation during night bombing attacks, rather they flew in "streams" often hundreds of miles long. So there wouldn't have been hundreds of turrets to bring to bear on a single fighter.
I think you're also overestimating how easy it would be to spot a blacked out fighter at night. A popular german night fighter tactic was often to sneak up beneath a bomber and then pitch the nose of the fighter up sharply while firing, racking the bomber's belly with cannon fire.
Many fighters were equipped with guns mounted in a vertical configuration called Schräge Musik. The guns would fire automatically when a magnetometer detected an enemy bomber was overhead.
I think that was the result of Dyson's study - a gunner never saw a fighter so they could just as effectively be removed or repalced with fixed guns.
And in Wald's research a night fighter still had some difficulty finding and approaching abomber even with ground radar - so they fired at it (using proximty fuses or upward firing guns) essentially at random points - there was no statsistical bias of the fighter pilot targetting specific systems
I think you're also overestimating how easy it would be to spot a blacked out fighter at night. A popular german night fighter tactic was often to sneak up beneath a bomber and then pitch the nose of the fighter up sharply while firing, racking the bomber's belly with cannon fire.
Many fighters were equipped with guns mounted in a vertical configuration called Schräge Musik. The guns would fire automatically when a magnetometer detected an enemy bomber was overhead.