self-defense on the ground is far, far less complicated than sport grappling on the ground. which is why this is a silly thread
Self defense without a basic knowledge of the techniques used in sport grappling (which are not techniques designed for sport, incidentally -- most of them ultimately comes from Fusen-ryu jujutsu) is an excellent way to increase your confidence just enough to get badly hurt. Saying "karate has newaza" without clarifying that it has no efficient techniques for escaping the bottom position or bypassing the guard is essentially deception by omission.