Honestly I would be fine with the alternate art being him with that platypus head, I think it's great.
Anyway I agree with the suggestion that the armor makes his head look smaller. It's kinda hard but if you can imagine him without the upper body armor, his head looks more sensible. Still a little on the small side, but not comically so.
Also I think you're right about Kairos being the strong silent type, I read that somewhere but can't remember if it was the character profile or Preybird's fan fiction, or both.
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