Not sure where Ray Horton figures into this thing, but he could be looking. He was a candidate for the HC job at Arizona after serving as the DC for the Cardinals the past two seasons. The Cardinals ranked in the top ten both years in total defense under Horton.
He does fit the mold as a DC with experience that Kelly is reportedly looking for. Furthermore, he is very upset, and let Cardinal management know he was upset, that the Cards didn't give him a chance to be the head coach therehe was fired. One other thing Kelly will like about him is that he appears to be a players coach, especially since he hasn't been out of the league that long, himself.