Yeah, St. Louis is planning on moving Buchnevich for a big return and as great as it would be to see him as a Bruin, I don't think the Bruins have the package or would be willing to conjure up a package to trade for him. DeBrusk would be a replacement for the Blues so that the Blues can still try to compete this season.
Detroit is in the same division so the price should be a lot higher especially since there is a chance to see them in the playoffs.
Flames need a forward, and you have to wonder if DeBrusk was part of the deal for a signed Lindholm. The player the Bruins want is Hanifin, but it will depend on what the Flames prefer to get in return for Hanifin. They could also just prefer to make a separate deal altogether for DeBrusk.