At this point last season, the Celtics boasted an offensive rating of 120.6. By season’s end, they were at 119.5, second-best in the NBA behind the eventual champion Oklahoma City Thunder.

Boston’s offensive rating through 23 games this season is — somehow, shockingly — even better: 121.9. Only the Denver Nuggets and Knicks rank higher.

Think about that: Jayson Tatum has yet to suit up, the Celtics lost a 17-point-per-game player in Kristaps Porzingis this offseason, and their offense, rather than cratering, has actually improved, at least in the modest sample size we’ve seen thus far.

How? Jaylen Brown’s performance as Boston’s new leading man has certainly helped. He’s scoring 29.0 points per game — including 12 games with 30-plus points and three with 40-plus — while also averaging 4

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