There are plenty of good athletes over 200lbs in boxing today. Wlad and Vitali Klitschko could be superstars in any number of different sports. Maskaev is big and strong could be a very good linebacker [if Russians played football-but then the NFL would be all Russian!]Povetkin looks like a very good athlete, Dimitrenko with training could play in the NBA.
These Eastern European men go through the school system that really build's them into top shape unlike the gym classes here that teach duck duck goose. Also the men in Russia give two years to the Russian Army-tough training build's tough men-so they win at Hockey, Boxing, Sambo, Weightlifting, Strong man contests, UFC,Etc.
That is why they kicked butt in the Olympics every four years and took over boxing in less then a decade!!!