I wouldn't either, but this staff seems **** bent on continuing to put him out there, so might as well minimize the damage he can cause. Maybe he can squeak out 5 innings if we can get some runs on the board.
Assuming Rosario is going to take the mound at some point, why not start him Friday against the weakest team? I know you risk taxing your bullpen, but I don't want to see Rosario on the mound against Ole Miss or Zona.