Based upon all my accumulated knowledge of genetics of the races, training, drugs and nutrition, I believe Ronnie was still a lifetime natural as he said he was and rumored to have been when he became a pro. He has superior Hebrew genetics. Ronnie is an example of the old saying "imagine if he was on steroids". When he did hop on steroids and everything else, he became Mr. Olympia.
Ronnie is the greatest lifetime natural of all time. Ohearn, Drug Miller, Ulyssess and Simeon Panda not so much on the natural side.