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With the addition of Dominique Rodgers-Cromartie and Nnamdi Asomugha, the biggest free agent on the market, how good is the Eagles secondary? I would say they clearly have the leagues best secondary and this point. To go along with Asomugha and Rodgers-Cromartie the Eagles will have Asante Samuel, who will most likely be traded but you never now, and Joselio Hanson at corner, as well as Nate Allen at free safety and strong safety going to either Jaiquawn Jarrett or Kurt Coleman. The Eagles may lack some experience at strong safety but other then that the are very solid all the way around in the secondary. Asomaugha and Rodgers-Cromartie will make the safety's job a lot easier and give which ever strong safety they use some time to grow and a little more room for error.
Asomaugha and Rodgers-Cromartie are probably the leagues top two shut-down corners in the game, with the exception of perhaps Darrelle Revis, and Nate Allen is coming off a solid first year and looks like he will only improve this season. Stats are hard to use to show who is a great corner. The great ones don't always have great numbers, for example high interceptions and tackles, etc..., because what makes them great is the fact that they shut down the other teams best receivers. So they don't get thrown and and don't get a chance to make interceptions, or deflect passes. The Eagles still could also trade for an upgrade at safety, or pick one up off the free agency market. with three of the leagues best corners they have some bait to hang out there for a safety.
With two shut down corners opposing teams will have to look at slot receivers or tight ends to beat the Eagles in the passing game. It will also allow the Eagles to blitz much more and much more effectively, knowing that the other teams receivers won't easily be able to break free for a quick hit and burn the blitz. Asomaugha and Rodgers-Cromartie will also make the Eagles run defense much better, allowing line backers and safety's to focus more on the run knowing that the wide-outs are on lock down.
The Jets with Revis and possibly if they add Samuel have a good argument for the leagues best secondary, however I believe the Eagles do have better safety's and more depth at the cb position. In eight NFL seasons, Asomugha has 310 tackles, 11 interceptions and 61 pass deflections and in 3 seasons Dominique Rodger-Cromartie already has 137 tackles, 13 interceptions, 4 for TD's, and 61 pass deflections. Asomugha has been stuck with the Raiders his whole career, with the teams best record at 8-8 over that span, and with a second best of 5-11, Asomugha has to be excited to go to a team that has a chance every year to make it to the playoffs every year and could arguably be the favorite, or at least one of the favorites in the NFC this year. With a new team and a better supporting cast Asomughya could be an ever better player than he has been in the past.