Thank you Greg, I can always count on you!
Name recognition and infamy were possible reasons indeed. I wondered whether the number of phantom victories Franks and Giblin found for Muller, von Tutschek and Goering were a reason for including these aces in their series? Were their reputations already under suspicion?
I hadn't thought about the intensity of air fighting in 1918 influencing the series, but it sounds correct to me: if four Germans shoot down four Americans in September 1918, how are you ever going to match them?
I know that von Tutschek and Immelmann (or his family) published their war accounts and their victories feature prominently in those works. As a matter of fact, quotes from
Sturme und Luftsiege by von Tutschek were used in the last book of the series.
Kind regards,
Reinout