Carlisle referenced J.J. Barea, the Mavs’ 14-year veteran reserve point guard, as evidence of a player with remarkable work ethic and mental toughness who came back strong from a torn Achilles tendon. Barea, 35, ruptured his right Achilles tendon in January last year and was ready to begin this season, when he has averaged 9.2 points and 3.3 assists in 15.6 minutes per game. “Nobody better and mentally tougher to come back from this than him,” Barea told ESPN of Powell. “Nobody has ever and will ever work as hard as he is going to do.”