if he's clean ok.. good delts,some build there,if he's on he should march right up to his dealer and punch him right in the mouth for selling him drugs that caused his arms and chest to gain nothing in terms of drugged muscle thickness .
There is a vein in the round delts, that automatically means steroid use, I learnt this on getbig
What about that defined delt pec tie in? Do naturals have this?