The Memphis Grizzlies have taken another big step toward rebuilding their roster, trading center Marc Gasol and leaving Mike Conley as the lone remaining piece from the core four of the franchise's best success. And Conley's tenure might only last the rest of this season. The Grizzlies traded Gasol to Toronto on Thursday at the NBA trade deadline, more than two weeks after owner Robert Pera told both Gasol and Conley that they would be listening to offers for two of the league's longest-tenured teammates. Memphis sent Gasol to the Raptors in exchange for Jonas Valanciunas, a person told The Associated Press on condition of anonymity because the details couldn't be announced until approved by the NBA.