When Sano comes back, it'll be a bench of Garver, Astudillo, and Gonzalez. The only way that changes is if Castro can't get into the "swing" of things and he is out-played by Garver and Astudillo; at that point, it because a bench of Garver/Astudillo, Gonzalez, and Castro. Castro does not have the versatility of those three, and quickly becomes the dispensable piece of the bench/roster.