What happened: Heading into the 2026 season, Terrion Arnold projects as a centerpiece of the Detroit Lions secondary. The Lions have leaned on their young defensive backs as a core part of how they want to defend, and Arnold sits near the top of that group.

Why it matters: A defense that wants to play aggressive coverage needs a corner it can trust on an island, and Detroit is betting that's Arnold. If he takes another step, the whole back end gets to play faster. That is why labeling him unproven undersells how much the Lions are counting on him.