I don't think you can prove or have data on whether yanking guys back and forth from the pen to the rotation can cause injury. And the Twins are far from the only ones doing this. That said, athletes train their bodies to do certain things, in a certain way, many times. I have to imagine for some players a change like that can be a precursor for injury. Whether it was for May or not is hard to tell, but I think he's said publicly that the bullpen role caused the back injuries and our resident medical expert has acknowledged there could be a connection there. Either way, devastating news. Trevor can't catch a break in his goal of being a major league starter.