Here we go again, with someone claiming that Haney retired, because of Yates.
What makes you think that Haney couldn’t have made more improvements as well? If I'm not mistaken, the two are fairly close in age.
And for the margin of victory, if my memory is correct, Yates only beat Haney in the muscularity round. The other rounds all went to Haney.
Also, keep in mind that Vince Taylor was heavily favored to win the Olympia in 1992.