At the end of the day, all Garrett has to say is something about soreness or tightness in his arm, and that is probably enough to stop him from pitching. It doesn't have to be "hurt" in a traditional sense of having an actual pull or strain. When it comes to this arm, and the fact that he is brand new to the organization, they are going to be overly cautious with him. They don't have a history where they might know that tightness for Crochet is indeed tightness and nothing to worry about.
I mean at the end of the day he could well be hurt, but for the Sox, they are going to bend over backwards if they even suspect that something *might* or could possibly, be wrong.