I'm surprised that Cossa is already here. Berggren is producing so well in a professional league and is such a solid bet to make it with a very good chance at being a difference-maker in the NHL. Tons of skill, already well developed, sky high ceiling.
Cossa also has a huge ceiling and as a goalie his impact could be pretty massive. We've seen a lot of highly touted goalies flame out though and nothing about Cossa screams "sure thing" to me. Personally I have Berggren, Johansson and Veleno before him. They're all much safer projections and unless Cossa is a top 5 goalie in the NHL someday, they'll probably have a very similar impact to him. I'm not confident projecting Cossa to be anything more than an average NHL starter which I just don't value as much as a top 6 W (Berggren), second pairing D (Johansson), or middle 6 C (Veleno).