I have a friend here that dosent know Jack shit about juice and dosent even know how to use a computer.He eats like absolute shit i mean he eats 10-12 cheseburgers from Mickey D's at a time.Dosent know how to cook so all he eats is fast food takeout most of the time.He never works his legs and he is 6'1" and weighs around 260+ with around 10% BF.He calls 5 shots of 200mg test a cycle and has never used any pct or anything like it.He has no idea about nutrition,and works out half assed.His brother is also about 240 with around 8% BF year round and has no clue either.So yes in some cases I believe genetics play the whole role of how big some folks are.