The next stop in our tour after the Titans position by position as we approach the 2010 regular season is one where we know the Titans will have a new starter: the cornerbacks (including the nickel back).
Fortunately, the starter they have returning is a pretty good one to build around. Considering the shambolic state of the Titans' 2009 secondary, Cortland Finnegan had a pretty good year, tying his career high with five interceptions despite missing three games. By Football Outsiders numbers, he also ranked 14th among cornerbacks in Success Rate, a measure of how well defenders do in terms of preventing successful plays by the offense.
The contenders for the other starting cornerback spot have some pretty big shoes to fill. Nick Harper of course started opposite Finnegan last year and put up some pretty amazing numbers. It's hard to throw at the same corner all the time and have success, but Titans' opponents manged it. Harper was, by FO numbers, the league's 3rd most targeted cornerback and the 4th least successful. On the other hand, Harper was one of the league's best corners... at run defense. He didn't miss many tackles and consistently stopped opposing runners for little gain. Whoever his replacement will be will almost certainly be a worse run defender and a better pass defender.