Kyrou isn't an Yzerman type player.

Make it a first and sure

I wouldn’t consider Berggren or Wallinder top prospects and Copp holds much more value to Detroit than he would to STL while that 2nd isn’t much of a needle mover. Blues definitely do get a better offer if they decide to shop Kyrou.

Edmonton is paying Campbell more if they traded him half retained instead of buying him out

This post made me somewhat think of a Chariot for Campbell swap, similar contract value and term, maybe Edmonton adds a conditional 2nd.
Might be better than a buy out or a dump, worst case both teams can just buy out the contracts as that's also almost identical.

No they do not. Please do not encourage this. It's bad enough as is.