My point exactly. Hitting and throwing objects are just as innate. In fact, if you look at toddlers you could argue that they are more innate. Pointed sticks are more universal than folk wrestling, so I'm not sure wrestling could be called more innate than striking. If we're trying to discern innate tendencies, then I would say grappling comes out as a response to being overwhelmed by strikes, or in acts of domination, such as rape.