Who knows on the severity (and obviously one is football and the other is pitching in baseball) but I know Greinke had surgery and he was only out like a month. You'd think throwing balls really hard takes a pretty hard toll on that area, too. Rodgers went with no surgery, IIRC, and took, what, 2 months? Yep...my understanding has been that surgery actually decreases recovery time on this type of injury, but I'm far from a doctor.