How an Indian Ocean victory would reopen Allied fleet plans

If the Royal Navy decisively defeated Japan in the Indian Ocean and Midway never occurred, how would postwar naval dynamics change?

The loss of five Japanese carriers would reopen Allied choices about carriers, amphibious forces, and containment, leaving the postwar outcome uncertain.

The scenario assumes a British victory in the Indian Ocean that sinks five Japanese carriers and prevents the historical Battle of Midway. Containing Japan would become easier, and the scale of the planned American carrier buildup would become an open question. An amphibious buildup and a further British advance would also have to be considered against Japan's remaining options. The United States might still continue its carrier program. Such a large change early in the war leaves the later course of operations and the postwar naval balance uncertain.