Shoulder problems

I've been working with two guys who I've diagnosed with identical shoulder injuries (not really injuries, as the main cause is age). They come to the gym at the same time, and do the same program together. One guy has made a full recovery, the other guy is getting steadily worse, to the point where I'm about to ship him off to a physio and refuse to work with him anymore in case I am actually doing damage. Bizarre how sometimes, there's just no accounting for the individual.