Let’s get this out of the way first: What is not yet clear on this Wednesday night, a little bit more than an hour since the Mets’ Jacob deGrom exited his start against the Braves after four innings and 46 pitches, are the long-term consequences of what the team has called a hyperextended right elbow sustained while batting. According to manager Mickey Callaway, deGrom felt that something was off after swinging and missing at a pitch in the third inning. He figured he’d be fine to pitch the rest of the night so long as he didn’t swing, but after the fourth he felt some soreness in his bicep and left the game.