The way I look at it is that everyone on the bench is replacement value except Sosa, who may be a little better. Pache was better in limited time last year, but he doesn't hit RHP. His main value is that if they pinch-hit for Rojas, he can play a good CF. I suppose he could also be a late inning defensive replacement for Castellanos.
But Cave is the only one who would pinch-hit for Rojas, and he's a poor option. There has to be someone better out there. I'm not sure that Robbie Grossman is waiting for Bellinger.
I disagree that Miller is as bad as Harrison. He wasn't very good for the Rangers, but he was hurt a lot of the time. Seems more worth having around than Cave.