Zero intelligence and Allied aircraft procurement

If American intelligence had not underestimated the A6M Zero, would British and Australian adoption of US naval aircraft change?

Urgent demand would still drive the Fleet Air Arm and Royal Australian Air Force to buy available American aircraft, while US designers would probably pursue more powerful engines and greater speed.

Better prewar estimates of the Zero would not remove the British and Australian need for aircraft already in production. The Fleet Air Arm and Royal Australian Air Force would still take usable American types. The larger change would occur inside US development programs, where designers could seek more engine power and speed earlier. Intelligence can redirect future design without instantly changing what allies must buy during a shortage.