Eichel to vegas because it makes the most sense

Stephensons and Krebs are interesting, but the rest of the deal is pretty meh. If Eichel went to Vegas, I'd except a bigger return

Krebs and Stephenson would be nice. Buffalo can take back smith too, he has no trade protection.

Agreed. I think it's more likely that you take the second away and replace Stephenson with Karlsson. Then the C lineup would be Cozens-Karlsson-Mittelstadt next year (maybe switching the last 2). I think it's nuts not to start Cozens as your 1C to give him that opportunity especially on a rebuilding team (a la Norris on the Sens)

They won't trade Karlsson and he would block the trade anyways

Dont want to rush Cozens, he still only 20, groom him for 1-2 years then see where hes at