Q for me is when do you move Antuna and / or Garcia off SS? One way to play things is to assign Garcia to Rochester and Antuna to Harrisburg and let both play SS as Turner re-signing insurance. I think Harrisburg is an aggressive assignment for Antuna since he'd essentially be skipping A ball based on his alternative site performance. I'd be astounded if he's assigned any higher, and if he's not on the same team as Garcia (or Cluff), then he should still play SS.
They both need to play SS, and those levels seem right (if not Wilmington for Antuna, at least to start). Neither one has proven he can hit enough to play anything but SS, so you give them the chance to do that and also to show they can stick at SS if not - and neither has shown that, either, although I think at least Garcia can.