Unfortunately for the Texans, their problems in the secondary aren't limited to the cornerback position. They have just as many problems at safety. Guys like Eugene Wilson and Bernard Pollard are fine as long as you let them roam around the middle of the field, react to the play, and help clean up the tackle.
It's when you are asking them to help your young corners in coverage that it becomes a problem. Too often last season, that's what the Texans asked Wilson, Pollard and others to do.
Pollard is a free agent himself and likely won't be returning if the Texans can find a suitable replacement. That replacement might come in the form of Eagles strong safety Quintin Mikell.
Mikell gives you a lot of the qualities that you love in Pollard, like the fact that he is hard-nosed and battle-tested. As an Eagle, Mikell has played in a ton of playoff games as part of one of the best defenses in the NFL over the last near-decade.
Mikell also gives you some things that Pollard can't. For one, he can play the ball and be trusted to cover receivers. Mikell has 10 career interceptions, including three this past season.
Along with the interceptions, Mikell also has totaled seven career fumble recoveries. That tells you that Mikell makes a habit of being around the ball. For a team desperately needing to force turnovers, that's what you like to see.