This is the timeline I'd aim for if I was the Twins: June-July 2017: Garver gets a call-up, potentially earlier if Murphy is struggling and Garver is playing well. 2018: Garver starts as the back-up catcher, may play more often based on both his and Castro's performance. 2019: Garver begins to take more playing time from Castro, again based on performance. Castro is elite defensively today and his offense is good enough to play as the full-time catcher. As that changes, Garver can begin taking playing time from him. There's no reason to cut Castro's playing time to a partial role before he's played a single regular season game for the team. Well, not for Mitch Garver, anyway. The guy looks to have an adequate bat for the position but it's far from overwhelming. As a 25 year old, he posted a .750 OPS in AA over 400 plate appearances. That isn't exactly lighting the world on fire. An added bonus for putting Murphy out there, finding what he looks like, and gaining an extra year of service time for Garver in the process.