The Detroit Lions, in part due to minimal movement during free agency, still have big holes to fill on their offensive and defensive lines.

While other mock drafts -- as covered here -- have focused on the offensive line at No. 23 for the Lions, colleague Todd McShay looked at the defensive line in his latest mock draft. He stuck with Texas defensive tackle Malcom Brown, who has been a consistent selection across the board as a potential fit for the Lions.

Detroit is clearly doing its research on Brown, too. Defensive line coach Kris Kocurek was at Brown's pro day at the University of Texas last week, and spent some time working out Brown. So there is clear and obvious interest in the 6-foot-2, 319-pound tackle. He would be a smart fit for Detroit so he could learn from Haloti Ngata for at least a year before either playing next to him in more of a full-time role or replacing him. Both Ngata and Tyrunn Walker, the scheduled starters at tackle right now, are on one-year contracts.