With NFL Free Agency well underway, it seems fitting to investigate the depths of the Carolina Panthers history. By looking at the team’s history, we will determine the all-time best Panthers free agency signings. This list won’t include anyone who was selected in the expansion draft. This list is based on the overall impact the player had on the franchise while receiving a paycheck from them. All-Time Top Panthers Free Agency Signings Sam Mills, LB After amassing 934 total tackles, 10.5 sacks and four interceptions with the New Orleans Saints, Sam Mills signed on with this new team in Charlotte.…