Speaking of the CB position, apparently Mike Klis keeps referring to Chris Harris as a nickel corner. See this article:
This prompts speculation about this coming from the Broncos themselves, which prompts further speculation about what it means as far as the draft or FA. Discussion of this, and several other items (such as Vickerson, Bannan, Terrance Knighton, Ahmad Bradshaw, Shonn Greene, the safety position, etc.) in the article linked below.