i dont know who joe and frank are, but if they are finishing in the top 10 in the heavyweight class at the usa's, then yeah, they probably arent completely natural.
believe what you want, but a guy came on here admitting the guys he trained that were winning the musclemania shows were using. how much more proof do you need? you think they were the only winners to use? if you think a non-user can compete with a user that does evreything else right and has decent genetics for putting on muslce, you are crazy. the guy even said the judges know the guys are using when 240 thought he was going to be smart and "report" these guys to the musclemania organization.
again believe what you want, but i've talked to a ifbb pro in venice, a guy that knew everyone and trained with numerous ifbb pros there, and even trained with a guy that was using that did a natural show, they all said the same thing, if you want to compete, you have to use.
skip is either the greatest ever or a liar. i'm not betting on greatest ever.