First, there’s no correlation statistically between faceoff percentage and wins. Either regular season or playoffs. So that’s really not a metric that’s important in the context of what you wrote.
Second, they’re at 51.34% High Danger chances at 5v5. So they’re above water. They’re also at 58%+ HDGF% at 5v5, which is third in the league. Last years numbers were better - shocker! But last year they were 15th in the league at CF% at 5v5 at just over 51%.
Third, regardless of numbers, we’ve seen that this team has only four (4) losses to playoff teams in regulation. Does that hold no water?
Playoff success is a different matter. Using Dom’s model at the Athletic (obviously there are others but they don’t differ all that much) only one team has a 50% chance or better to win two rounds in the East - the Hurricanes, owing to what will be the easiest playoff matchup odds wise in the entire NHL. (I would use Moneypuck, but their model hates the Panthers for some reason and gives Toronto a 5% higher chance of winning two rounds than the Panthers. Their playoff model has always been FUBAR).
Dom has the Bruins with a 55% chance of winning one round, projecting them to play the Maple Leafs, the toughest matchup in the East for a favorite. Even the Panthers are projected as only a 77% favorite in round 1 despite a ridiculously easy WC matchup. There’s an undercurrent of inevitability here that the Bruins are doomed to lose in the playoffs. And yes, that is almost certainly true. But even the best teams have only a 15% odds of winning the Cup.
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