It is pretty surprising that they are not doing worse. However, I think we also might be underestimating the number of injuries in baseball for all teams now. Baseball has become a game of attrition where the amount of depth a team has become almost impotant as the number of top performers they have. It seems players are pushing their bodies to get the highest performance possible, but injuries have become so commonplace now that perhaps the pursuit of excellence has become counterproductive, especially for pitchers.