Its about upside. There is no doubt the Swede is better now. I think everyone believed he was more developed going into the draft, Difference is Cossa is bigger and more athletic. Walstedt is more well rounded and positionally sound. Cossa, who is still performing to a very good level has better tools while the Swede has a a better toolbox.
Me, I liked Wallstedt more last year, but if Cossa can develop his fundamental to the same level, he could be the better goalie due to raw tools.
It will be interesting, but if Cossa can keep up his habit of the last 2 years of elevating his game as the stakes rise, we're still a long way off buyers remorse.