I want to believe this guy. What I've learned during my competitive years (natural for life, but never preaching) is that there are just many genetic freaks around. And if someone has top genetics AND is fully committed he/she can be an extremely good natural bodybuilder.
When looking at Jeff, I notice that he looks very normal in clothes, but starts to shine when he's on stage.
I myself have average genetics only, but have been training (25 years) and dieting seriously (10 years) for a long time. Look at my arms: they measure less than 17'', yet on contest day they look ok. Now imagine a freak that can bring up EVERY muscle perfectly balanced, chiseled...
OPEN YOUR MIND, or you will only limit yourself to what you can achieve.
-peace