If I remember correctly, you said that overweight individuals might have higher amounts of androgen receptors in their lower body (legs), and therefore has an easier time growing their quads. Not to critisize what you said, the stereotype of steroids users DOES have much larger torso in comparison to the lower body. But when your are overweight, you constantly walk around lifting quite a lot (ofcourse this depends on how much your weight is) with your legs. Might this have something to do with overweight people having large (muscles) in their legs?
DHT is a potent agonist of the AR, and is in fact the most potent known endogenous ligand of the receptor. It has an affinity (K d ) of to nM for the human AR, which is about 2- to 3-fold higher than that of testosterone (K d = to nM)  and 15–30 times higher than that of adrenal androgens .  In addition, the dissociation rate of DHT from the AR is 5-fold slower than that of testosterone.  The EC 50 of DHT for activation of the AR is nM, which is about 5-fold stronger than that of testosterone (EC 50 = nM).  In bioassays , DHT has been found to be - to 10-fold more potent than testosterone. 
Gold had no patience for complainers; he made gladiators, not big-armed girls. The son of a Jewish junkman, he'd grown up in the working-class slums of ., and he had learned to fight his battles when the Polish toughs hassled him after school. In high school, he began hanging around the Muscle Beach Weight Pen , where the giants of the day posed for boardwalk crowds that grew to the tens of thousands on weekends. Gold got big there and formed lifelong friendships, and though he was gone for long chunks of the next two decades – to the South Pacific in World War II, where he was injured by a torpedo strike, and to South America with the Merchant Marines until he quit sailing in the early 1960s – his heart was firmly docked off Muscle Beach. When the authorities shut the Pen down in 1959, declaring it a magnet for "low morality" (read: big bodies, small swimsuits, horny tourists), Gold's friends scattered to dives like the Dungeon and a new, bare-bones weight pit on Venice Beach. Gold built his gym to bring those beasts home, and charged them the sweetheart rate of $40 a year. "If you didn't have the cash, though – and a lot of them didn't – Joe would let you slide," says Drasin. "Hell, at some point or another, he supported half those guys. Paid 'em to show up and do nothing."