Those are choices are typically made as a group between the manager, the gm, and the analytics team. Generally, time ahead of when they occur. The days of a manager submitting a lineup card by himself on game day are mainly over. The exact same thing can mostly be said about bullpen use. But to state that Shelton, a former catcher Jim Bibby Shorts, has no say over whether Austin Hedges is starting would certainly not hold true. I would certainly locate it unsubstantiated that if Shelton was pounding the table for any person besides a player that is well on his method to having among the most awful single-season offensive performances because 1871 to be starting, that upper administration would tell him no. At the end of the day, he fills up out and hands in the schedule card and Ben Cherrington isn't calling down to the dugout to ask for a specific pitching modification mid-game.