Why would the Bruins move Matty G who is on a team friendly contract at 3.6 (with term left), Jake DeBrusk and a 1st for Klingberg who's offensive numbers have dipped the past the years and defense numbers are brutal during the past 3 years? Not to mention the rumour has it, Klingberg wants 8 years and 8 million which is a bit crazy to resign.

First, Boston isn't going to trade assets for a RD that they don't need. McAvoy and Carlo already have the right side of that top-4 locked down.

Second, if they did trade Klingberg to Dallas, the Stars really don't have interest in this deal outside of the 1st Round Pick. If they are trading Klingberg, they're sellers & prepping for a rebuild. Grzelcyk is not a "rebuild" piece & DeBrusk is a struggling bottom-6 winger at this point, who may never return to the form we saw from him a couple years ago

If you're serious about trading for Klingberg, trade pieces that would be beneficial to the Stars in a rebuild. Guys like Studnicka, Vakanainen, Lysell (very likely not even on the table), Lauko, Lohrei, etc. are guys that you should look at moving. They would benefit Dallas much more given where their organization currently sits.