Hard to know for sure without seeing your roster, but a trade like this should help you go for the win. As long as you have room for these players without dropping a good player and aren’t stacked on goalies already I’d make the trade.
This is a fairly deep league (16 teams) so there is a goalie rule stating you can only roster 2 if they are on different teams (can also have a third if that goalie is on the same team ex: can roster Fleury if I own Gus). If I make the trade I have another deal in the works to send Lyon for a depth winger. I then would call up Kochetkov (no longer NA eligible) and drop Gus. Kakko could also be a casualty unless added into the Lyon deal. This would leave me with Vasi and Kochetkov as my tandem.
I would not do the deal for a few reasons. First, it sounds like you would be dropping Gustavsson to make room for Vasi. In a Dynasty league I wouldn’t want to drop Gus. Zegras is on IR, but I really like his long term upside. Laffy is also a player I’d like to own in a dynasty league. After poor deployment on the ‘kid line’ he is finally getting decent deployment. He is still a little bit aways from PP1, but he took a good step forward this year and has looked good. The points will continue to come for him. You’d also be giving up Power who’s long term value looks pretty solid.
This is just way too much to give up in my opinion.