Garcia is barely 21 now and less than 2/3 of his minors experience is at SS. He's not ready to be an MLB shortstop, though all signs suggest his glove will get there, which puts a ton less pressure on the bat.
I don't expect them to overthink this. He plays if Castro's leave is a week or less. That's not going to mess up his progression. If it is longer, and he plays like a regular, maybe they say fine or look for a permanent fix. It's not like 3B wasn't something they needed to fix if they were actually back in contention. And, if he lights things up, I don't think they are going to say "but we want you as a SS so you have to go to Rochester." They deal with the unfortunate circumstance of having developed another young quality regular at that point. My expectation is it'll either be short term or just a muddle and he will eventually get sent down.
