PhysioBob,
I couldn't agree more. Video would help. I've had to sort out a couple of shoulder issues that were similar, but to try and figure it out from two still photos is not likely to happen. One client who's shoulder did that had and unstable SC joint and not a great AC joint. The "deformity" that occurred when he protracted and tensed his pects, was pretty much muscle and scapula (although out of its usual place with very abnormal muscle tone), not anything that couldn't be identified with palpation and joint play. This client could click his shoulder at will.
Hope it goes well for you Andy1992.
Braedan
Canuck Clinician from Total Outcomes Physio Surrey!