What happened: Tatum said he is very comfortable taking a larger leadership role entering 2026-27. He pushed back on the 'his team' framing, saying he needs the other 14 players to shape the group after the nine-season partnership ended with Brown's move to Philadelphia.
Why it matters: Boston opens 2026-27 without its longtime two-star structure, concentrating creation and accountability on Tatum. The reset tests depth and locker-room balance as the Celtics retool around a single veteran cornerstone.
By the numbers: Tatum-Brown partnership lasted nine seasons before the split.
What to watch: Watch camp for rotation roles around Tatum and first preseason looks at the retooled core.