Ronny C. won the Universe natty.
Arnold only used steroids a little.
Joe Weider about anything.
Define "a little". Today, people would claim the amount of anabolics Schwarzenegger used was a little. But, his predecessors (i.e. Vince Gironda, John Grimek, etc.) screamed that the Oak and his contemporaries were steroid abusers, taking a whole bunch of stuff.
As for Coleman, his contemporaries have backed his claims for decades. Guys like Levrone and Wheeler were amazed that Coleman wasn't using what they were, yet he was still hanging with them. Shawn Ray referred to the pre-Sandow Coleman as a "C-level" bodybuilder.
I've brought up this issue earlier on another thread. But, if pro cards were so hard to obtain in the late 80s/early 90s and drug tests are so easy to pass, why didn't more NPC journeymen tried to get to the Universe to turn pro?
I know that, from a media standpoint, winning the USA or the Nationals (or even the North American) got you more covers and more spots on shows like "American Muscle" than winning the IFBB Mr. Universe/World Amateur Championships did. But, if you'd been slogging in the NPCs for a while (i.e. Bob Chicherillo), why not simply "go off" for a while and try your hand at the U, especially when it came with an Olympia bid at the time?