Shoulder injuries suck. They are debilitating.
I had a small tear in my shoulder 3 months ago. I only play Basketball, but even after 2 months out it is still sore, and I have absolutely no faith in it.
His injury will be in his head every time he attempts a tackle. Same as a bloke who has done an ACL, every time he tries to move laterally he will know that the knee isnt 100%. Every movement made with the shoulder will cause pain and even worse will be the resistance in the joint and muscle. The feeling that the movement will cause another tear.....
Should have time off to get right, but at the business end of the season neither he or the club have that luxury.