I am not related to physiotheraphy in any formal way, I am a guy who effed up his body while doing sports improperly, i.e. not knowing the biomechanics of a human body. So know I am trying to educate myself on this, though it is too late.
Anyway, my friend probably has problems with infraspinatus and all other rotator cuff muscles, which is quite usual situation nowadays. I haven't tested him, because I don't know how to do it (though google suggests some tests).
Anyway, thanks for your observations and for your reply. Can you recommend any specific exercises to solve these problems? I think that stretches for the anterior part of the body (pec minor, front deltoid etc.) and strengthening the scapula adductors, rotator cuff muscles and increasing extension in thoracic spine would be a good place to start building the base for further more precise corrections.
When the photos are thrown into the internet, they become the property of the internet, so yes, you can use them wherever you want. But anyway, thanks for the honesty. If you get any ideas from your colleagues and students about this particular case, post it here, because any feedback is appreciated.