SURPRISE, Ariz. - Each January, the Rangers invite their top pitching prospects to a week-long mini-camp to work with the major league staff and get a leg up, so to speak, on spring training.This year, there may be a group of prospects with a leg up on them.While 18 young pitchers were working out in Texas, another group of 10, most of them relievers, were sent to Seattle to work with Driveline Baseball for a secret secondary-pitch intensive camp.