Genetics have nothing to do with it. Anyone who puts in 15 years of solid focused drilling like the Japanese do is going to get cauliflower ear. You look at every Turk, every Kazakh, every Iranian and they all are exactly the same way. That is because these are very drill concentrated grappling nations. Then look at the Americans, the Russians. Cauliflower isnt as prevalent because we are more live sparring type grappling nations. I could be wrong, but I have been to many long training camps around the world and have been around foreign wrestlers for the last 10 years, and it never changes.