The Detroit Lions’ defense could take a drastic step forward under the leadership of new coordinator Kelvin Sheppard. Defensive backs Amik Robertson and Terrion Arnold both expressed following practice on Saturday that Sheppard is quite relatable as a leader and could actually still be playing in the league, based on his knowledge and physical stature. Former defensive coordinator Aaron Glenn was quite energetic, but Sheppard could even be more passionate than the new Jets head coach.