ALLEN PARK -- Terrion Arnold notched the first interception of his young career last week, and the Detroit Lions were encouraged with his showing.

But the Lions still see room for improvement, especially in one important area that they hold dear to their heart. Kelvin Sheppard pointed to the run defense they expect from their cornerbacks.

It’s something the defensive coordinator has carried with him since his time coaching underneath Aaron Glenn. Arnold has continued to improve and clean up his coverage, but Sheppard wants to

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