I think we have to be careful putting Lake into the mix. Just because he has been doing well teaching the DBs doesn't mean he can be a DC. The DC is required to match with against the opponents OC. It takes a talent to guess what the opposing offense is going to do. How do we know Lake can call plays? How do we know he can adjust? These are some of LeBeau's strengths. Butler has spent years at DL's side learning these things where Lake is just a baby at it. Just some food for thought.