NFL free agency 2022 -- Most improved teams so far, key signings, best roster moves and more

The AFC is absolutely stacked. Young, star quarterbacks Patrick Mahomes, Josh Allen and Joe Burrow had their respective teams in the Super Bowl discussion last season, and now Russell Wilson is in the AFC after being traded to Denver. The likes of Lamar Jackson and Justin Herbert have their teams on the upswing, and second-year QBs Mac Jones, Trevor Lawrence and Zach Wilson are poised for second-year breakouts in 2022. And don't forget about solid veterans Derek Carr and Ryan Tannehill.

As if that isn't enough, the AFC has dominated the early stages of free agency, including several clubs that were already considered top Super Bowl contenders. Sure, things can change, as we're still in the heart of the free agent process, but dozens of impact players have already agreed to sign a new deal. That's enough of a sample for us to recognize the franchises that have made the smartest and savviest additions and re-signings to this point.

Here are the six teams that have aced free agency (so far) and the key additions that will help get them to the next level.

Key signings: WR Mike Williams, CB J.C. Jackson, DT Sebastian Joseph-Day, DT Austin Johnson

The Chargers entered the offseason with their star quarterback Justin Herbert on a rookie contract and plenty of cap space. And thus far, they've done a nice job taking advantage, including the addition of one of the league's top cover corners in Jackson. The ex-Patriot joins 2021 second-round pick Asante Samuel Jr. to give Los Angeles a formidable perimeter presence, and the duo will be joined in the secondary by star safety Derwin James Jr. and Nasir Adderley. That's an excellent group.

The Chargers' run defense was putrid in 2021, but they've taken steps toward fixing it, adding