I dont know what it is, but even watching the dev camp scrimmage, it seemed like Augustine was so much more in control of his movements and puck tracking.
It's their size and style differences.
Without getting into the weeds, the more technical goalies always look better to the average viewer because of conservation of movement. There's a perception that conservative movement is more reliable and consistent, which indeed can be a boon. Athletic goalies (which is Cossa for sure) tend to "flop" or scramble more frequently in an attempt to make difficult saves, which can look fairly dramatic, for both good and bad highlights.
As Wings fans, we saw Nedeljkovic suffer some humiliating goals because he's an athletic guy in a smaller frame.
I know I keep bringing up this comparison, but take a look back at Luongo and watch his movement. It's pretty aggressive, especially foiled with all the big guys deep in their net these days (Ben Bishop is textbook for this). When when Luongo was on, he's going to steal you the game. When it's going poorly, he appears to be flopping around a bit.
Another guy I think fits the profile would be Pekka Rinne. If I'm Cossa, I'm watching his tape a lot, too. Lots to learn there.
Ultimately I've seen both approaches work in the NHL, although I am biased to the more conservative approach (thus my favor of Wallstedt over Cossa at the draft), but the ceiling of the athletic guys is the kind of goalie you dream about having for a decade plus. Think the aforementioned Luongo or even Hasek. Ed Belfour. I'd even put Bordeur into this group. A current example is of course Vasilevskiy, who is both insanely athletic while also being technically incredible (and why I was so high on Askarov and still think he's the best goalie prospect in the world).
It's not an either/or situation. I don't want to come across like it's that simple. All of these guys had exceptional fundamentals at a technical level and for Cossa to succeed he's going to need that completely shored up by the time he hits NHL ice.
And one final x-factor that makes goaltending the bane of so many...
It's the mental game. Drive. Competitive spirit. Work ethic. These are important for any NHL hopeful, but especially so with goaltending. In everything I've seen of Cossa, it's that mental preparation and drive that attracted the Red Wings over other options. Which is pretty smart, because that's a make or break quality between some of these guys. So much of goaltending is between the ears, you hear that expression constantly, yet we tend to undervalue it when looking at scouting reports.
In short, I'm really excited about both Cossa and Augustine. I'm immediately sold on why the Wings took Augustine and I think you,
@jfrank21 , saw that when you were watching him in the scrimmage. His footwork and movement is very clean and that's exciting to see in such a young goalie, even if he doesn't fit the size profile of the modern NHL goalie.