Steve Silverman • The Boston Celtics are going through a season in transition. The die was cast in last spring’s playoffs when All-Star Jayson Tatum suffered a torn Achilles that would force them to change their game plan and lessen their expectations. Since the start of the season the Celtics have been fighting to stay over the .500 mark instead of dominating the Eastern Conference, as they had done with a healthy Tatum in the lineup. In games where they get off to sharp starts, they were often successful. However, in games where they fall behind, they have a hard time mounting comebacks.