You are definetely the winner. I don't think I've even seen another natural bb that big in person or in the gym.
How about Theoak* and his challenge. I thought he was the best when he posted his side tri (before he took it down), but I doubt his drug status.
How much more can I possibly grow naturally, say in 10 years worth of training.
Alot, especially in college, where you have food aplenty. I knew a dude in college that I called SuperMuslim, or "T" ( he wore alot of wife beaters) . My freshman year I thought he was upperclassman because he was so built. But he was Freshaman like me. He would only eat fruit (I "only" saw him eat fruit and veg) and lectured me on the dangers of eating meat. I told him that if only I could get to be 185, he laughed and said, "I remember when I was 185." He was about 5'6-5'7.
He was one of those, "body is the temple dudes", who didn't take drugs, didn't smoke, didn't drink, chose "peace with one's environment"
His theories and and lecure were off the hook, but his mind grew with his body. The same could be true for you.