I don't think it's really possible to settle anything w/ that graphic. You would 1 more angle of the same shot at least. In real life his shoulder joint isn't just sitting there stationary in one location. It's moving with his shoulders. And it's moving with his body. And he's also pushing up with his legs. And his wrist is doing things. And his forearm is pronating. And he's also probably moving a little bit forward maybe. And maybe he's pushing up on a slight angle etc etc. There's a lot going on you can't see from only a top down view.
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