Forgive me for seeming ignorant, but I'm not seeing where using your mouth to play a video game pertains to genetics, unless somehow one or more of his parents did? I'm just saying to me it seems more like determination and learning to use different tools in order to play (and win), which has very little to do with his genetic makeup.
As it stands, genetics are physical traits, not (proven yet to be) mental or emotional. You can be the smartest person in the world and your kid could be a complete dumbass. I'm just not buying into genetic ability, especially when there's no proof due to none of these guys having parents playing on the scene.