The deal gives the Jets a potential star corner to play opposite the one they already have -- All-Pro Darrelle Revis. The Chargers were looking to ship Cromartie out of town after what they deemed a lackluster effort in their playoff loss to (ironically) the Jets, but the Jets are of the belief that a change of scenery and playing for Rex Ryan might fire Cromartie up and bring his talent back to the fore.
If that's what happens, the Jets' defense could be armed with two lockdown cornerbacks, which would allow Ryan to continue to run his blitzes (knowing he can cover the receivers without help) and reducing the need for the Jets to try and find an edge pass rusher on the off-season market. As one of the final four teams from this year's NFL playoffs, the Jets are severely limited in the extent to which they can pursue free agents.
The trade was first reported by Jay Glazer on FoxSports.com.