I don't know about wrestling history. The Chinese wrestling can be traced back to yellow emperor time period (2711 BC?) This picture can be traced back to the Chin Dynasty (246 BC ~ 207 BC). - The wrestling double legs drops knee down. - The Kung Fu double legs does not. - The wrestling single leg uses both hands to grab the leg. - The Kung Fu single leg uses one hand to grab the leg, and use the other hand to push the upper body (neck, shoulder, head, ...).