Kemba Walker is averaging 20 points per game over the last several weeks against point guards as diverse as Trae Young, Patrick Beverley and Malcolm Brogdon. The Celtics beat the Clippers behind his scoring and playmaking as Jayson Tatum struggled and Jaylen Brown disappeared into the second half. Is Kemba fully back from his knee injury? John Zannis resists but the evidence is growing and that has implications on Boston’s ceiling and Brown’s role. The Garden Report debates.