In considering how the Bruins might fare this coming year, I thought it might be somewhat instructive to have a peek at the team’s main advanced stats for last regular season, and see if they tell us anything about where last year’s crew were at beyond the raw fact of their ridiculous win percentage. The core numbers state that, 5v5, Boston were 15th in the league for CF%, 7th for SF%, 9th for SCF%, 10th for HDCF%, 14th for xGF, had the 3rd-lowest xGA, were 8th for xGF%, 1st for SV%, 2nd for SH%, and 1st for PDO. Their PP ranked 12th and their PK 1st.
A very basic analysis from these numbers is that in their general play they were a very good but not outstanding team that was nonetheless able to elevate well above the rest of the pack and put together a record-setting season largely through a combination of exceptional goaltending, great finishing, a little puck luck, and that more intangible mental or ‘seize the moment’ factor in having the ability to consistently drag themselves to positive results even when their general play was not at its best. They were a middling team in terms of puck possession and a bit stronger defensively than they were in their ability to generate offense, and this also extended to their special teams play, where they were decent on the PP but boasted a league-best PK. Their ability to excel above what their stats might suggest was further reinforced by them having the 3rd-highest positive differential between their expected and actual goals scored, and the highest of all between expected and actual goals against.
A couple of things suggest themselves from this. Firstly, the numbers indicate that the general performance of the 22/23 roster did not set it apart over and above the other strong teams, although they were still comfortably within the top 5-10 in the league. And it’s highly unlikely that any team could maintain the win percentage or the significant exceeding of statistical/expected performance that the Bruins managed last season for a second year in a row, even if the roster hadn’t changed at all.
But of course it has. The biggest challenges as the roster stands now are probably around reduced forward depth, a weaker middle and a loss of forward defensive capability. On the positive side the goaltending and most of the defense are still intact, and to some extent at least they can handle the weakened areas in the knowledge that they can afford a reduction in their performance compared to last season and still be in playoff contention. However they don’t have as much room to regress as might initially appear. Factor out the exceptional save and shooting percentages and last season’s team was probably closer to a 110-point outfit than 135. So they can probably drop 10-15 points from that level and still qualify, but not 30. Obviously it’s not all that simple, especially when you consider that one of the key reasons for the 22/23 team being outliers – the goalies – are still there.
I think though that the general point stands – there’s good reason to think Boston can still be competitive this coming season, but they don’t have to slip too far to potentially be in trouble, especially when you factor in how strong the Atlantic should be. If they stay mostly healthy and Ullmark and Swayman stand and deliver again, they should be in the mix. But if either of those things don’t happen, it could get dicey. It’s certainly going to be interesting to see how it pans out.