The RAF’s retention of downed pilots kept them in the fight as replacement fighters arrived from the US and Canada.
The US recovered pilots (US and Jap) after the Battle of the Coral Sea.
It became standard policy after Midway.
These pilots gained skill and kills and soon dominated the air. They were often outnumbered in the air in dogfights vs the Jap fighters. But these Jap fighters had only a fraction of the flight time of the Pearl Harbor, Coral Sea, and Midway veterans. The inexperience resulted in loopsided defeats. The Jap commanders did not figure it out until it was too late.
Ger and Japan built thousands of fighters after the loss of skilled pilots, but the bulk pilot skill differential was soon set against them.
People are not born with wings, or 3-D maneuvering / positioning instincts.
The Axis leaders saw air power as only industrial output without factoring in the thousands of hours of flight time to adequately train pilots to be victorious over their enemies.
WWI was deadlocked in attritional ground warfare. WWII was won by mobility. Air mobility gave you local supremacy. Sea mobility gave you range. Ground mobility allows your troops to fight more efficiently. Both sea and ground mobility are subject to air supremacy.