I don't believe that relievers are ever truly "blocked" in the minors. Unless every single reliever is pitching lights out, 1.00 ERA 1.00 FIP ball, there's always an opening in a bullpen. As we saw last year, Jepsen, Perkins, and Fien turned into pumpkins. This year it could be anyone turning into a pumpkin. There's room to sign 1 or more bullpen arms.