Hard to say, i know someppl here in sweden that are pretty big totally natural. Dont know if they would like it if i posted pics of them though, will get back..
To be in a natty show you have to be clean for 3 months or something.... so who knows if they used juice. The size those guys are is attainable for guys with good genes natty... but what makes me second guess is how they get contest lean and stay big all natty. Seems next to impossible to me... but I have no idea.
I think Reeves and Grimek used orals....shit if you want natural you gotta go back a few hundred years man....maybe Spartacus was natural, but then again maybe he ate bull testicles....does that work i wonder?
During the early days of the Greeks and Romans......They were still trying to use whatever "un natural" methods they could. It might not have been test or dbol but they still cheated all the way back then.