That's amazing that it's been 21 years with 32 teams in the league. If there are some talented white CBs coming out of HS, I bet a lot of those guys automatically try to make it as a WR or switch to safety when they get to college.
Last year Riley Moss, also out of Iowa, was rated as potential starting CB and got drafted by Denver. Don't remember hearing about him after the draft, and it looks like he only got in a few games as part time player late in the season. Not sure if he had an injury?