As also explained before, male almost always gain another 20 pounds in the next five years, then another over the next five years.
In other words, if he were to age as is normal, Torreyes would be pretty much the exact size of Raphael Furcal and only a couple pounds below Pedroia and others.
I don't know why you would "think" he'd be one of those 1-2% outliers, as the numbers are really in favor of him gaining some significant weight. Body frame has nothing to do with gaining weight. Only metabolism.
And unless you know his doctor or have some kind of crystal ball, I cannot foresee how you might determine he's got the Golden Metabolic Ticket, so to speak.