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Denver had three notable cornerbacks on the roster in 2014: Dominique Rodgers-Cromartie, Harris and Champ Bailey. The only one left of that group is Harris, and he's coming off a partially torn ACL.
Now, this position certainly wasn't ignored. Aqib Talib was brought via free agency in to replace DRC, and all signs indicate that he'll be able to do the job, despite how brilliantly DRC played last year. The team also took Bradley Roby with its first pick, and word out of camp is that he's been impressive, both with his athleticism and his aggressiveness, per Tim Lynch of SB Nation.
In some ways, this puts Denver in a good position, but it ignores a few key things. Namely, this is not the 1960s NFL, and you really need three good corners to succeed. You have to be more stacked against the pass than the run, and that nickel corner has to be good enough to play just about every down if pressed.
You can't afford to have the nickel corner be a guy who was too slow to play on the outside, a second-stringer. Not anymore.
Denver may have a good set if Talib, Harris and Roby can all play. The issue is that Harris hasn't played a down since his knee injury, so he's an unknown. Talib has an injury history as well, so who knows if he'll hold up the whole season. Roby is a rookie, and rookie corners traditionally struggle. It'd be great to see him buck that trend, but you certainly can't count on it.
At the end of the day, the team could have used more depth. I still think it should have tried to bring in Talib and retain DRC. He was terrific. Even if Denver didn't like him for some reason that I'm missing—he was never going to retire, despite that story—there were other good free agents out there. Heck, Asante Samuel is on the market right now.
Denver's cornerback position looks tentatively good going forward, but it leaves no room for injuries and growing pains, and that could be a huge liability.