Yates of 1993 would win. 1995 version too. The 1994 and 1997 versions looked like shit. Hope that helps. Comparing pics is not reality. Pound for pound, Kai is bigger than Yates. He is shorter and heavier. He has more muscle, enough said. However, Kai does not usually come in the condition that Yates was. If Yates came in as six time Mr. Olympia he would be gifted 1st or 2nd. However, if he were a random new guy who nobody had ever seen before, they would be astounded by his back, but that is it. His abdomen was bloated and a wide. His arms sucked. His thighs were conditioned, but not in Heaths league as far as aesthetics and striations. Heath would win easily.