Wow, scarcely do I mention Kirby's writer/artist run in AMAZING ADVENTURES 1-4, than a day later I run across this outstandingly intelligent video discussing those stories, as a microcosm of the recurring themes in Kirby's storytelling and artwork.

Jack Kirby's Evolution - Comic Tropes (Episode 68)
https://www.youtube.com/watch?v=2ZKcMQFjErk