The reason Duke Williams grabbed a lot of attention at Shrine week and again in the Senior Bowl is because of his ability to come down into man coverage in the slot and fare well there. He's physical in coverage and has the speed and athleticism to keep up with players there. I watched him erase receivers with physical press coverage during drills at Shrine week and he had some of that going for him during Senior Bowl week as well. The NFL loves that. They love safeties they can trust to come down and do that, even though sometimes I wonder why, since NFL defenses don't seem to do it often enough. He definitely plays with an attitude though, has that certain something to him that you think is going to make him a play maker at the next level.
The down side is that when I saw him in regular zone safety coverage, he wasn't that interesting as far as his instincts to the football went in coverage. But he was on USC's radar coming out of High School, he just wanted to play for his home town team.
Also, there are off field problems going on with him that are going to hurt him. He had an outstanding warrant on him for failure to appear in court for a citation, and then in 2011 he got into an accident and the police found that he had an expired license, expired registration and was driving without insurance. He was arrested on the outstanding warrant and also given citations for the other stuff. Previously in 2009 he had been arrested for underage possession of alcohol.