Recent talks of Darrelle Revis on the trading block have linked him with the 49ers. Revis would be an instant upgrade at CB, but the price would be too high and there's no guarantee he will be one hundred percent ready for 2013 coming off a ACL injury.
After having a strong regular season, the secondary show signs of weakness when they allowed more than 300 yards per game in the postseason. This included Julio Jones and Jacoby Jones receiving deep passes for touchdowns in back to back playoff games. There was poor communication among the safeties and CBs, and Chris Culliver is most remembered for struggling against the Ravens in the Super Bowl.
There is a bigger issue in this which is the defensive line. After 15 games in the regular season, the 49ers were able to average 2.5 sacks per game. The pressure was consistent from Aldon Smith and Ahmad Brooks thanks to the play of Justin Smith and Ray McDonald. When Justin Smith went down with a torn triceps injury against the Patriots, everything went downhill as the front-seven were unable to generate pressure. Both Aldon Smith and Justin Smith failed to record a sack during the postseason and were blocked majority of the time.
While the secondary can make improvements, it isn't the primary need. The 49ers have Cullen Jenkins visiting this week with a focus on the pass rush.
Ricky Jean Francois and Isaac Sopoaga are free agents, making Ian Williams the only NT currently under contract. Justin Smith is also entering the final year of his contract and if he is injured again, the DE position becomes thin.
With so many potential changes coming, the 49ers will look to have new faces for the defensive line. They have not been in contact with Revis, nor should they be treating him as their primary need.