This will be the next trade to prove why the goaltending position is a joke and total crap shoot and why you should never invest big money or spend valuable assets for one. (Not saying Ottawa did in this case, it's a good, low-risk deal for them).
Ullmark was a scrub on Buffalo, then a Vezina winner, then couldn't even hold his starting job one season after the Vezina. There's a reason why Boston has had three different Vezina winners in the past 15 years. (And who would be surprised if Swayman makes it 4)?
Goalies are a product of their team and their system. They are giant, inflated, Michelin men who drop to the ice and let pucks hit them. If their team doesn't keep chances to the outside, block shots, and limit odd-mans, they are toast. I'm betting on 2.87 gaa and .900 sv% for Ullmark behind the Sens next year while Korpisalo puts up Vezina numbers in 25ish starts.
Teams make goalies, goalies don't make teams.