He's never been a cover Safety, he was a Monster Man at OU, that hybrid LB/S that they could plug in anywhere and the QB had to account for him. Parcells knew exactly what he was getting and initially used him as the Sooners had but once they had to make him into a real S, the flaws were apparent.
I don't know what he did to the Dallas Morning News but the day after the Cowboys beat the Packers to go to 11-1, they ran a very negative article about the weak link in the secondary. That article fanned the flames to the point of him admitting he feared the ball coming his way. That was an awakening for me. Here's the most feared tackler in the NFL that made the violent highlight shots must watch sports TV admitting that. I was floored. How could the team, the coaches, let the media get to him like that and he was a shell of his former self. Then, he did the unforgivable, he began to try and make it look like the other DBs' fault when he got beat. In football, you own your own mistakes.
Roy OU Williams was the top Cowboys D player that I have ever seen fire up his team with one play. The roar of the crowd was close to the one they made when a TD was scored. I didn't care if the O had a 3 n out because that would get him back on the field. He was smaller than Atwater or Fulcher but he hit harder than both of them.