Off and Def are points scored and allowed per 100 possessions while the group was on court; Net is the difference. Possessions are estimated from the play-by-play. Compare each group with the whole-team row. Groups with under 32 minutes are marked as small samples.
On/off compares how the team did per 100 possessions with the player on the court and on the bench, in games he played. It depends on teammates and opponents: starters often face the other team's best players, and a strong bench lifts the off-court numbers. Ranked players need 79+ minutes on and 26+ off; 1 below that aren't ranked.