Let's not overlook Wolf.
He's currently 3rd in sv%. The flames 5v5 defense has been good, ranking 9th best in the league. But their PK has been absolutely abysmal, ranked 26th best.
He's been the best player on the flames most times when he's on the ice.
Im not sure you can say the same for Michkov when Konecny leads the team in points and goals by a decent margin, and certainly not Stankoven.
Obviously a lot can change and it's far more likely Michkov maintains around a PPG than Wolf maintaining his current sv%.
But at this very moment? I do think Wolf has been the best of the rookies.