BOB a mistake ? --- The Battle of France

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What is well-known, and well-documented is that the strength of the Luftwaffe at the official start of the Battle of Britain on Adler Tag, 15 August 1940, was below that of its strength at the start of the Battle of France on 10 May 1940, i.e., the Battle of France definitely took a bite out of the Luftwaffe. There were other factors, as well, such as the massive re-equipment of the Kampfgeschwadern with the Ju 88 which caused some units to be taken out of line for training in the new ship.