Why Aubrey Fitch aboard Hornet would probably change little at Midway

What if Admiral Aubrey Fitch had been sent aboard Hornet for the Battle of Midway?

Probably little would change: Fitch would face the same limited choices and would be unlikely to improve on the least bad option available.

Aubrey Fitch was a capable officer, but Hornet's immediate choices would still be constrained. Replacing the senior decision-maker would not automatically produce a better option. The existing decision is judged the least bad of the available alternatives, and Fitch is considered unlikely to choose a worse one. The expected result is therefore little change beyond the officer's name attached to it.