Maybe Jacob is just hyper sensitive to every twinge that pitchers generally feel? Look at the cover gallery above. There have been a number of times, over several years, where he reports something, gets an MRI, and then he gets a bill of health. Ron Darling said something about how in his day, if a pitcher did that he'd be called a word that he can't say on the air. (It's cable, but whatever. My guess is that the word is "pussy".) I think this is just going to be the deal with deGrom. Sure, one day one of these injuries may cause him to miss an extended period of time (as one did at the end of 2016) but we'll have to get used to him occasionally pulling himself out of a game early. He's said that he wants to pitch until he's 40 or older and he's clearly doing what he can now to increase his chances of having a long career.