I'm not talking about takedown defense (that's pretty much a given in the current MMA context). I'm referring to what DB was pointing out in that video - actually avoiding going to the ground, which is not the strategy of all in MMA; some have going to the ground as their strategy (ground-n-pound). I don't consider that an effective SD strategy, as it both exposes the proponent to other attackers (girlfriends, etc.) and exposes them to legal issues. On the other hand, it's a proven, effective strategy for MMA competition, so no reason not to use it there.I think this shift is very common. Its a matter of strategy.
Every mma fighter learns take down defense and all the rest. Some are just better at it than others. And because if how they train, the guys who can't do it well know it.