Looks like that darker area is a tat, long before he got his Samoan tat's (Pe'a). In NFL & NBA terms, he is a natural wide body.
Gyno...hard to say but later on in life, yes. Samoans are not always fat, some are leaner and others look pretty average. The general public only see Samoans on TV/movies and the NFL. Though, even the average looking ones seem to grow pretty fast when starting to workout.