Hi,
The physio did not mention any exercises I should be doing or about the 2.5cm gap but reccomended when I play tennis to take ibuprofen before and use ibuprofen gel on the shoulder as well and also to ice the shoulder 3 times after playing to reduce the swelling. I was initially assesed by peforming movements with the arm but only had the "heat friction" treatment when I visited. I also read that having an ultrasound allows him to understand the type of seperation there is (there are 7 different ones in total) and from that he could persue the best treatment. As to having the taping , I reckon that will be another option if this does not resolve the issue. Ill keep you posted.