I think you're vastly over-estimating how much captains "coach" in these things.
The comparison to a football coach who actively makes calls re: strategy, deployment, alignments, plays, etc. is not appropriate.
And again, Stricker is out there captaining right now. He won the last PC.
My Marines knew how to fight too. But sometimes it takes leadership to pull them all together into a cohesive unit rather than just a group of highly talented individuals.
There’s a reason we scrutinize football coaches that lose too many games despite talented individual players too.
Just a thought...