Haney retired as he was going to have to up the dose and even then he wasn't guaranteed too beat Yates. So he retired. Im a Haney fan as well. But no version of him was beating Yates in 93, no one in the last 31 years since has either. Including later versions of Yates.
You're assuming that Haney couldn't have made a similar jump in size. It's not as if there was a huge age difference or anything. Haney is only 3 or 4 years older than Yates.
Yates has maintained that he dieted off too much size in 1992 to ensure he was in condition, and all he did in 1993 was not shave off those extra 15 lbs. He has, in recent interviews, shown pics of him 6-8 weeks out in 1992 (which look quite similar to his 1993 pics that far out from the Olympia).
As long as Haney and Yates were the same size (or fairly close), Haney beat Yates on shape and proportion.
Strydom could have got lost at the California state titles from behind. Front Side looked great, his back wouldn't win the LA.
Hence, why we call it bodybuilding, not just back-building. Strydom has bested plenty of guys with better backs that his was (Christian, Pearson, Quinn, etc).