Okay, someone has figured it out, as per a PM. That being said, he didn't want to end this so here's another clue, or two:
1) This pilot was the highest scoring pilot from his country
2) This pilot flew his combat missions for another country
3) This pilot usually flew alone, not with any sort of formation or wingman
4) This pilot was "loaned" the plane he flew by the country he flew for
5) This pilot only flew combat for a year, crashing his plane himself, not due to enemy action