Mike Vrabel underwent an NFL team reconstruction this offseason, trying to clean up the messes left by the previous personnel operations. It was a major undertaking as virtually every positional unit on the team needed bolstering.
Vrabel attacked the problem aggressively in free agency. In retrospect, his goals were clear: add playmakers to each level of the defense and virtually every unit on offense, barring the tight end room (though he did add a promising undrafted free agent even there).
The coach needed to improve one area specifically after not re-signing veteran Jonathan Jones, the cornerback position.