LOS ANGELES >> When Juan Castro served as a roving assistant in the Dodgers' front office, Pedro Baez was a young third baseman cutting his chops in the low minor leagues.As he canvassed the Dodgers' farm system, Castro would occasionally cross paths with Baez. Both men spoke Spanish and played the same position, so Baez was the perfect pupil for a retired infielder making his maiden voyage into a post-playing career.