In all honesty, the only reason Ghassempour moved up to the non olympic weight of 92, is that for many years, he could never beat Yazdani. He was 86 for years before he moved up.
when the Yazdani came from back his injury, Ghassempour was trying out for 97, and he decided it would be too difficult to get down to 86 after bulking up for 97.
During this world championship, they said he was at 91 without losing weight, so he is definitly a natural 86. When you look at Yazdani and Ghassempour next to each other, Yazdani looks a little bigger.