WHEN LEGENDARY MARINERS announcer Dave Niehaus died last November, he left a hole so big that the team decided to fill it with not one voice but five. A rotating cast of analysts—all of whom have called games for the M’s before—will split time in the radio booth this season alongside play-by-play man Rick Rizzs. But given Niehaus’s microphone mastery, what are the chances they’ll replace the Hall of Fame broadcaster in the average fan’s heart?