It made sense as they just traded Vrabel. Conner Barwin was a hot name thrown around by media and fans. Clay Matthews was also a hot name for the Pats to take with their 1st round pick.
He was a SS in college, but Bill forced him to play FS where he wasn't good. Bill admitted he made a mistake with Chung. Chung was awful with the Eagles as well. Bill also forced Darius Butler on the outside where he was clearly struggled. I loved the Butler pick and Deion Sanders hyped him up, but he wasn't an outside CB.
When you think about it, one of the only reasons why McCourty moved to S was because Chung was injured. Had Chung not gotten injured, McCourty would've stayed at CB where he was getting historically toasted and his regression started in the Divisional Round against the Jets in 2010. He was getting worse each year and he actually may have left a lot sooner had he never made the switch to S.