While a number of players across the roster have enjoyed breakthrough seasons on some level or another for the 2021 Boston Celtics, Jeff Teague has disappointed. Signed to a minimum contract this offseason, Stevens and the Celtics hoped that Teague could step in and fill the void left by departed reserve guard Brad Wanamaker. But while Teague has certainly demonstrated Wanamaker’s aptitude for frustrating Celtics fans at times, he’s done it without contributing positively to the team’s success the way Wanamaker did. Through 13 games, he’s having the worst season of his 13-year NBA career. So what’s gone wrong?