IMHO if you read between the lines both MvR and Guynemer were at some point near mental exhaustion (to put it kindly). In the cases of Bill Bishop and
Elliot White Springs its not even a guessing game . I have read ( although at this moment I can't say where)that during Bishop's stint as squadron commander he shook visibly throughout his entire body before a flight. Elliot White Springs reinforced himself with alcohol. Certainly I do not mean to disparage any of these men. For they all performed what they saw as their duty in spite of their nervous systems lack of co-operation. The triumph of these men's will (and certainly there were countless others) in spite of approaching mental and physical collapse is probably their greatest legacy.
As Guynemer was quoted, "Until one has given all, one has given nothing."
It does not matter whether you or I believe this today. He believed it, and that was his greatness. As well as the greatness of his generation.