Tatum is BY FAR the most valuable player on the Celtics. His on/off differential per 100 possessions is +17.2, while Brown's is -1.2 (Teague and Timelord have a better differential than Tatum, but they are no where near as important). This continues the trend from last year, that Boston just falls apart without Tatum on the floor and the team is just better when Brown is on the bench. Obviously some of that is who is backing them up, but it also goes to some level at the actual importance of their roles to the team. Tatum doesn't even to play well for Boston to just be better with him on the floor. Boston needs Tatum. Boston doesn't need Brown. And it has been this way for awhile. In fact, Tatum has basically led the the team every single season of his career, while Brown has been positive just 1 of his 5 seasons (his 2nd year when Tatum was a rookie). And Brown has been negative in the playoffs as well the last 3 years, while Tatum has been positive every season. And Tatum is the most valuable player because he is the best player. The offense runs through him and falls apart when he isn't on the floor. Boston is Tatum.