Letang has averaged 1 PPG on defense his whole career and has suffered because he's doesn't have someone to play with. Quite frankly, he's a top 5 defenseman in the league. Not too mention Sprong and a 1st. That's a clear overpay for a guy who's out the door. I'm sorry but the clock is ticking on Panarin in Columbus. You cash in your chips before you leave with pennies on the dollar.
As for the Jets, I think Hornqvist plays with Ehlers as a skill-crab combo and Armia is more of a 4th liner on a Stanley Cup team. You want four good lines and Armia is a 4th liner on a good team. Armia is your solid chip-in a few times a week kinda guy. He's nothing special. Hornqvist gives them an upgrade at wing, and Oleksiak as a big body defenseman and direct replacement for Trouba. Not as good but a serviceable replacement nonetheless.