The issue with Lexington is the avgas leak after she was hit at the Coral Sea. If someone at either the Bureau of Aeronautics or Bureau of Ships figures out the dangers of leaking Avgas far sooner. Then her sinking is avoided. Although Lexington would still be in no shape to fight at Midway.Let’s go with options one and two. How would these improvements affect the careers of the shifts? For example, does the increased sortie generation. Save Lexington at Coral Sea, or at least sink one of the. Might it save enterprise from that last kamikaze by leading her to being the surrender ship?
As for Enterprise. It’s down to a matter of luck and manoeuvring.