Erich unusually I have to disagree with you about the timing of the collapse in Luftwaffe pilot quality.
No organisation can lose 141% of its strength in pilots over a 12 month period (1943) and maintain its quality. Yes,units could be bolstered by bringing in surviving experienced men,but overall the quality has to have fallen. This was compounded in the Luftwaffe by the virtual collapse of the training system in late '42 and early '43.
Steve - it isn't cast in concrete but I was told by Galland in the company of Tolliver that a significant population of air losses in 43 were 'churn' of replacement pilots (in the West). The skilled pilots and wingmen started a higher % of the attrition rate in the fall as combined RAF sweeps and US fighter escort incursions to locations like Solingen, near Hamburg Frankfurt, etc forced more engagement by JG1, JG 11, major elements of JG3 and ZG 76 etc set up behind JG26 and JG2. The fall and winter declines were more serious because skilled resources were also being drawn from the East and a higher percentage of East replacement pilots were going down
I might do a little project if I get some time off. How many of the Luftwaffe's Staffelkapitan who survived the BoB,let's say from August 1940, were still alive in December 1943? I don't know the answer but it might be revealing
Cheers
Steve