Just saying, he needs to stretch more, his upper pecs are to tight, people underestimate how much shittier a tight muscle looks.
It gives you that shortened look, jay is the perfect example like he is stuck is position and when he flexes, nothing, no pop, no pop because the fibers are matters.
Have him do some extreme strecthing, getting the fascia really loose truly helps with fullness, im convinced.
He looks crazy, his skin is really thin.