Question here.
I thought the premise was to develop your air force around one, single type, not to use real war data to compare anything that actually happened. This is a pure and simple "what-if." If no other fighters had been available, what fighter would you choose to develop your air force around and why? Did I get that wrong?
The premise was by good fortune during 1937-1939 you had the ability to pick the best (for your war fighting doctrine) possible fighter that WWII produced and extend it and develop it throughout the war
If all we had was the P-51, we'd have developed the crap out of it. If all the British had was the Spitfire, they'd have developed it even more than they did, and that is pretty well-developed. If all the Germans had was the Ta 152, they'd have developed it into a large-scale, production fighter instead of a few production prototypes.
In fact, the Germans might have done better if they had done less development. The sheer number of prototypes of something like the Ju-88 alone, if the effort expended had been put into production of fewer but operatioal types would have helped to an extent. You can accuse the Germans of not developing prototypes.
If the Soviets had hordes of La-5 FN's at the start of the war, they still might have suffered at the start what with the lack of personal initiative allowed at the time, but they would not have sacrificed so many obsolescent types so ineffectively had the only mount been a good one from the start.
Had the Japanese concentrated on the Ki-84 at the start of the war, things also might have been different.
Naturally, we all assume one of the better fighters.
But what if all we had was the P-40 and the Germans ony had the He-112? If you ask anyone about reincarnation, they mostly assume they used to be the Pharoh or the Queen of Sheeba. Very few think of their potential former lives as a one-eye, hairlipped goat-roper from ancient Saint Louis. So the possibility is there that at least ONE air arm would only have a poor or mediocre fighter with which to conduct the entire war.
Start another thread.
Under these conditions, I'm not sure the actual war record is of any import at all.
Perhaps I midunderstood the question.