Comments by "Steve Valley" (@stevevalley7835) on "The Drydock - Episode 317 (Part 1)" video.
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wrt the question about 1939 AA upgrades, iirc, one of the issues with the Vickers Pom-Pom was that no-one in the US made cordite, and the Vickers did not work right with USN smokeless. My preferred alternate would be the Browning designed, Colt refined, 37mm, that the US Army used. Add the refinements that were added later in the war: ammo feed from either side, and ammo in metal link belts, rather than clips, and the 37mm could have been used in the same style of mounts as the Vickers. So the USN could have had a locally produced Pom-Pom, that had better range than the Vickers.
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