I would suspect he would not have been the high scorer he was with Germany. It was a different kind of fight. The classical Dawn Patrol had Allied planes flying east, into the sun, clawing for altitude. The Germans, who could sleep later, were waiting, thereby having the attack advantage. Allied planes had missions to carry out. The German mission was simply to stop them. Allied planes had tail winds going to the target, head winds on the return leg. Bad for those wounded, engines running badly or low on fuel. Richtofen [Germans pilots in general] would pick off these stragglers. Last, Allied pilots flew a tour of duty; the Germans, as in WWII, flew for the duration.