Lions defensive coordinator Kelvin Sheppard did not hold back when talking about Terrion Arnold during a recent interview. The Detroit Lions have some serious secondary issues headed into the 2026 season. Detroit released cornerback Terrion Arnold back in June after he was arrested on kidnapping and robbery charges. “What I'll say is Terrion Arnold had No.1 cornerback potential, but it was still untapped. The Lions will already be testing their secondary depth, so losing Arnold makes that situation worse.