Firstly there is obviously Arnold, he had an incredible combination of great size and asthetics. Besides his maxed out muscles (chest, biceps, calves) he was relatively small compared to todays top pros tho. next great reign was obviously Haney. Whilst i prefer Arnolds physique he was obviously more "complete" from a technical standpoint. His lat spread was sick, but yeah, in my own modest opinion his main contribution was bringing an overall more complete look. Next up was Dorian. Ive seen pictures where it looks to me that Haney was dominating him. On the other hand it is obvious that he brought A+ conditioning to the stage and some amazing mass as well and along with Haneys era Yates time is the time in bodybuilding i know the least about. Lastly, Ronnie Coleman, obviously there was very different versions of Ronnie that won Olympias but what can i say about the guy. He was an absolute monstrosity, a contender for best arms, best chest, best back, most mass, etc etc... My only critisism, is he seemed to usher in the era of the huge GH gut. I could be wrong tho as as much as ive trie to learn about the sport in the last year or so, having been a casual fan for years, i still have plenty to learn. my questions are, which of these long reigning mr O's brought forth the most change, and also, which one brought the most positive change to the sport?