Having read a lot about the air campaign over Europe over the last couple of years, I would gamble this weakness was known at least informally among Luftwaffe p

Having read a lot about the air campaign over Europe over the last couple of years, I would gamble this weakness was known at least informally among Luftwaffe pilots, if not stated explicitly in training materials. This is exactly the kind of information that was passed around both informally and formally in the Allied air forces. Bomber commands on both sides used this kind of information to develop high-level tactics (for example, the evolution of the Allied box formation, and the responsive evolution of German attacks of Allied bomber formations).