My evidence is as a scarred Moops OU fan. I just think he's better suited to coach a position and be hands on and aggressive. Just not overseeing the whole defense. Should he have a p5 job right now , No. But if the rumors that he was headed to Texas are true, then apparently Sark did see something in him to coach lb's.
I was equally shocked when I heard he would be coming to Texas for that role but I figured it made more sense as a position coach than coordinator. Kind of the way Charlie Strong is coaching linebackers for Urban Meyer in Jacksonville now.