The Arizona Cardinals did not have a great season on defense, no one would argue that.
However, Chandler Jones had one of the best seasons in Arizona Cardinals history. Not just one of the best seasons, but his December was a historic one that was capped with an NFC Defensive Player of the Month award.
From the team:
This is Jones’ second selection as “NFC Defensive Player of the Month” with the Cardinals after previously winning the award in December of 2017. He was also named “AFC Defensive Player of the Month” in November of 2013 with the Patriots.