It would be a convenient narrative to say Roman Harper joined the Panthers in free agency to get two opportunities every season to exact revenge on the Saints, who released him last month and are one of Carolina’s NFC South rivals. But Harper insists what was most attractive about signing off on a two-year deal with Carolina recently was a front seven that includes linebacker Luke Kuechly (the reigning NFL Defensive Player of the Year), linebacker Thomas Davis (the NFC’s Defensive Player of the Month in November), Greg Hardy (a 2013 Pro Bowler) and Charles Johnson (among the league’s sack leaders with 11).