I have been hoping for this switch for a while now. I know the Broncos did it under McDaniels and it did not exactly work so well. Sorry to bring his name up.
This defense can really be special this year, assuming they are healthy. The only point of concern to me is NT. I thought the loss of Pot Roast was a big loss, but I think it can be dealt with. Hopefully S Williams will live up to that first round status this year. He will sure get his chance with out any excuses.
The pass rush (especially when Wolfe returns) should be the best in the NFL imo. Von Miller was a projected 3-4 OLB coming out the draft. That is his absolute natural position. Demarcus Ware, is also far more comfortable as a 3-4 OLB. Combined with Malik on the DL and Shane Ray. There is a lot of room for creativity from a 3-4 look imo than what has been done under Del Rio.
Even though the defenses under Del Rio did pretty well statistically, it frustrated me to see Von Miller not being used properly. In the 4-3, Von Miller pretty much rushed when he was kicked down as a DE. When he was back at OLB, he hardly ever rushed. That is one of the misnomers about OLBs in a 4-3. They are NOT edge rushers. Their sack production is not typically very high. So, for 4 years Von Miller was easily identified. The opposing offense knew when he was coming, and where he was rushing from. He would typically rush against bigger OTs. Now, they will be able to move him around. They will not if he is or if he is not coming. He will be getting RBs blocking him a lot more.