I, like everyone else, have wondered why Bobby hasn’t at least tried Juan Cruz in a more prominent role. He’s moved up more inexperienced relievers. And if they aren’t going to use him, shouldn’t he be starting in Richmond.
So I came up with The Hypothesis. This is that Cruz is being kept on the Atlanta roster specifically to work with Leo. Bobby isn’t using him because the Braves are limiting his game work (while he’s working on the side), but they won’t send him down because they have plans for him in the future.