What happened: Boston went 440-234 with Brown and 90-36 without him during his tenure, equal to winning rates of 65.3% and 71.4%. The comparison
Why it matters: The split offers a blunt measure for evaluating Brown's exit, though team records do not isolate opponent strength or lineup availability. Boston must now replace a scorer who averaged 28.7 points, 6.9 rebounds and 5.1 assists in 2025-26.
By the numbers: Boston's winning percentage was 6.1 points higher without Brown across the full sample. Over the past four seasons, the Celtics allowed 111.9 points per 100 possessions with him on the floor and 106.7 with him off it.
What to watch: Boston's 2026-27 results and Brown's new on-off numbers will provide the next test. Larger samples should clarify whether the historical gap reflected his impact or the lineups around him.