I agree with the theory....but sometimes the drugs tend to make up for the fact that the pros are dumber than a sack full of hammers when it comes to training or diet. Not all, but some would not place as high because the gear makes up for their ignorance. Also you have to deal with the LAZY factor...if you took their gear away many of them would not put in the effort to reach their genetic potential.
When I was natural before gear I got to 238 lbs at 6'1'' and 20 years old. I than cut down to 218 lbs and did fina, test, and eq and shot up to 258 lbs very quickly. I can easily be 300 plus lbs and lean and I should be within a year I believe.
Not a completely logical argument....genetics still play the ultimate game of levelling. Drugs simply allow you to reach your potential faster. Two identical twins - one natural and one not will eventuall each get to the upper limit of his, her genetic ability. One faster than the other.