Andrew Robert's Masters and Commanders is a good read if you want to know more about Pound and Churchill.
IIRC He makes the point that Churchill had decided to take his whole Chiefs of Staff team through the war, favouring consistency. In the end Pound was the only one to be 'subbed', for Cunningham.
I had the privilege of interviewing our local butcher for my school history project on the Arctic Convoys, as he had been a seaman on PQ17. He had never talked to anybody about it before, or since. I think he only agreed as he already knew I was set on a military career. Hel is cold, not hot.