You're talking about a controlled sparring match where the agreed upon notion is to not hurt your partner. Most people are not going 100 percent, flight or flight, life or death. That changes things when a big strong guy is doing everything in his power to hurt you. A one year white belt, especially one who hasn't trained specifically to deal with someone trying to pound their face into the mat, is by no means guaranteed to dominate every untrained guy in a real fight. It's just not realistic.