Without talking value, here's why it makes no sense for Montreal.
-Trouba is RFA, need to be resigned, with our 855K of cap space left, and with the salary that Trouba is looking for, Montreal would need to include roster players to have enough space to sign him.
-If the deal were to be made, Montreal would protect Weber, Petry and Trouba for the expansion draft, leaving Beaulieu unprotected. So in this trade, Habs could end up losing Beaulieu, Sergachev and a 1st for Trouba.
Fact is, I would rather try and see what Beaulieu can do this year with Weber as a mentor and gamble on Sergachev being a top 2/4 in this league. He is one of the reason, IMO, that the Subban trade is bearable. I'm not saying he's going to be as good or better than Subban, but is surely does have a similar skill set.
Fair enough?