Call me a hater, but I have never really thought Markström was a good goalie to begin with. And to be honest I've been a bit flummoxed by everyone seeming to think that way the last couple of seasons.
He had one or two decent seasons in Vancouver with their system at the time being a defensive one that really supported Markström's stats, while the goalie himself looked shaky against every actually good team, and then he got paid a ton by Calgary for seemingly being a top 10 goalie in the league. And while he's been better in Calgary than I expected at first, this is still the result you get when you put him up against a high octane offence like Edmonton's. He's just not that good.