I'll move my grade from a D to a C+ given that it seems like Chevy was willing to go all in but was stymied by player choices. Players haven't had a problem waiving before at the deadline so I'll assume that some players aren't sold on the Jets long-term viability in the playoffs, which I can understand to a degree given recent history. Colorado and Dallas do seem more like teams built around the playoffs.
That said, I feel like I'm in the minority when it comes to trading youth or picks. I understand wanting to keep the pipeline open but this is a team with a player like Scheifele who's good for top 15 in scoring in the league each year, Kyle Connor who's like a better Phil Kessel in his prime (and a year away from free agency), Ehlers who is a free agent after this season and none of the prospects seem like they're going to reach that level, Pionk playing way above his usual level, Vilardi who's (knock on wood) actually had a healthy season for the most part, Hellebuyck playing probably the best season of his career - are keeping mid level prospects like Lambert and late 1sts that could just as easily end up as Vesalainens instead of Connors, really worth giving up one of their best chances to win the Cup that they'll likely have in a long time?
Some of the people on here thought Dallas made a mistake giving up Stankoven and two 1sts for Rantanen, Stankoven MAY produce at Rantanen's level eventually, likely not though, and those two 1sts are likely to be late. They've got players playing well, in their prime, younger guys that they want to win now. It's not a bad deal in that context, nor is it really a bad deal in a vacuum given Rantanen's past performances.
Hopefully they keep 1st in the Central (I don't see them losing it at this point, it would take a mega collapse and a legendary run from Dallas to do that) because a 1st round matchup against the Avs would be a real mental test.