After the first year, you will have at least 5 guys who were effective at starting games (mostly due to acceptable stamina ratings), those guys become SP. Everyone else becomes a RP and I just move them up or down to SU or CP based on performance. My default is to put the highest rated guys at CP and SU to start. If i notice over a couple months some guys are getting shelled and someone in the MRP spot is pitching great, I'll swap accordingly. I only carry 3 CP on my roster, and those are the highest potential, highest rating RP. For example, if I promote my AA CP to AAA, he starts over as a RP. (An additional benefit is if you are renogotiating, RP make less than CP
) If a guy gets moved out of CP for an extended period of time, guess what he is a RP again.