Would it have mattered if Japan had a very "Flat" navy? Say scrap the Yamato project in favor of 3-4 modern fleet carriers. Also, build a lot of light carriers from old and new heavy cruisers. Could a development program for carrier-based fighters have produced consistently superior fighter aircraft compared with those of the Americans for at least 5 years of conflict? Could they have matched the US' monthly output of of newly-trained navy pilots? The rest of the Japanese navy units will become escorts, heavy on anti-submarine and anti-aircraft warfare. Surface combatants would avoid line engagements using battleships and limit themsalves to fast run-in attacks like those in the slot. Last question, not related to the thread question: was there ever a single-engine, carrier based bomber capable of both dive and torpedo bombing?