Three years ago, Al Horford felt the clock ticking on his career and a chance to win a title. So, he left the Celtics for the 76ers. But Horford was a disappointing fit in Philadelphia. In a cruel turn, the 76ers salary-dumped him onto the tanking Thunder. For a player whose teams had never missed the playoffs, Horford was further than ever from his desired championship. His contract was so onerous, it appeared he might toil in Oklahoma City years before it’d make sense to flip him. By then, the fear was, Horford could be washed up.