I've posted this a few times, but it all makes sense if you look at Nolan's defenses in the past. And, it also explains why were are in no hurry to get Everson Griffen or Clowney.
In our base, DLaw will play primarily as the WDE. At that spot, he may have his hand down, or he may be in a two-point stance. I don't think he will fall back in coverage very much, but he may now and then to confuse the QB. Keep in mind, that was the role he played at Boise. Crawford will be the SDE/5T, where his primary responsibility will be to keep the T occupied, so our SLB/DPR will only have to beat the TE on the outside. The SLB/DPR will likely be Smith, Gregory, or Anae.
In our nickel, DLaw will switch back to the SDE with the SLB/DPR becoming the traditional WDE, BUT - in Nolan's defense, in Nickel, sometimes both ends will be in a 3, sometimes they will be in a 2. Most of the time they will rush, but sometimes they will drop. And in Nolan's defenses, the WLB will be rushing the QB A LOT more than they did in Rod's basic 4-3, which is why Smith is moving to that spot.