The guy was in a shoulder brace in the conference championship, the national semi and the championship game. It was a problem. Take care of it now.
The good news is -- its likely not a full tear (he wouldn't have been able to lift if it was) -- if they can do the repair with a scope that is best but they will want to make sure its not more so they will likely open him up..this adds to the rehab.
I agree that missing time will hurt him badly in year 1 -- but its upper body -- meaning he can keep his legs, do cardio, stay in good shape. If its a small tear he can begin light strength training by the end of June and once that starts its all about his healing power...based on this kids desire and character I bet he will be doing side reps by the middle of August...