After educating myself through reading the wizard-mind takes on hfboards, I'd like to set a few things straight...
Linus Ullmark stinks, and his contract is brutal. The 8 games he struggled following an injury is the true sample size that shows what he is. Yeah, he was a good goalie for 7 years, but that doesn't matter. And his current insanely hot stretch of 7 games is a fluke, he'll soon revert to his usual self, which was the 8 games of struggle.
Korpisalo is one of the best goalies in the NHL. His good play for 1 month is the most important sample size. Ignore his 7 year career of inconsistency and mediocrity, that's what we call a small sample size. And his .901 is actually better than Ullmark's .910, because Ullmark is once again benefitting from a great defensive team, what the Ottawa Senators are known for.
Mark Kastelic may be on the 4th line, but he is an ascending star. Sure, he has 0 goals 3 assists in his last 20 games, but that's a small sample size. As is his inconsistent play with the Sens. He'll soon revert to his typical 7 points in 11 games form of October.
Conclusion: brutal trade by the Sens. Ullmark's luck will soon run out, and he'll be back to his usually crappy self. Kastelic and Korpisalo would have guaranteed a 100 point season from the Sens.
To be fair and unsarcastic for a moment, I still believe in Jeremy Swayman. He was outstanding for the last 2 years. The insane pressure after holding out and signing a huge contract is giving him problems. I guarantee he returns to form and has good seasons in most of his contract, whether he returns to form this year or next year.