Frank Jack Fletcher was capable but not needed in the main rotation

How capable was Admiral Frank Jack Fletcher, and could he have joined the main U.S. Pacific command rotation?

He was capable enough to do so, but the Navy already had an effective rotation with Spruance and Halsey.

Fletcher receives a favorable professional assessment as a capable, flexible, and intelligent commander. Those qualities make a rotation alongside Spruance and Halsey entirely plausible. The reason it was unnecessary is institutional rather than a claim that Fletcher lacked ability. The Pacific command system already had enough senior leadership in the established Spruance-Halsey arrangement.