What about his arthritis, shouldn't that come into play? Its a lifelong condition that will only get worse, not better, and the more times he destroys that same joint, the less likely he will ever be able to run effectively on it again.
You cant play a guy that cant run, thats in itself the definition of a career ending injury in a sport where you have have to be able to run....
Over long periods of time, the inflammation associated with rheumatoid arthritis can cause bone erosion and joint deformity.
While there's no cure for rheumatoid arthritis, physiotherapy and medication can help slow the disease's progression
He has had this for a long time. Compounded with multiple joint injuries, this is absolutely potentially career ending.
About the only thing he has going for him right now, is his age, but i have read of cases of arthritis that have crippled people by the age of 30, and that's without blowing out your acl over and over.