The face is back in the Cubs' marketing efforts. The smile is back, too, though maybe not quite as easy, definitely not quite as automatic. Starlin Castro has learned that much since his worst offseason in the public eye. He also has learned just how much appreciation a guy can find for the early-morning, daily grind of an uneventful spring training in sleepy Mesa, Ariz. "I don't think any more about that stuff,'' he said. "I just let my agent do his job.'' Since addressing a throng of media on his first day at camp about offseason allegations of sexual assault, Castro has kept his mind completely on baseball.