Maybe, and I'm not some Ritchie booster, but to be fair
It's also miniscule sample size skewed by one huge outlier game.
So far together they are
But in the Washington Capitals game they were 0 For 12 Against. Take that outlier out and they are now 26 For 27 Against in the other 3 games which is okay. It may not sound great but:
1) They also had a rough night in the Red Wings game which was Dube's first NHL game at Center since Calendar year 2018.
2) These were all road games where Sutter couldn't control the matchups out of faceoffs. Players/Teams typically have worse analytics on the road for this reason.
3) These were all games in which the Flames were either tied or held an extended lead, so score effects were significant. Teams leading rarely have a CF% over 50 whereas teams trailing almost always do. This is because teams loosen up their defensive gaps so that big mistakes don't lead to goals against.
Considering score, venue, a significant outlier game, and a transition back to centre for Dube, that line probably deserves some more time together, especially at home where Sutter can cushion them against 3rd pairs and such.