The 2015 class of defensive linemen is one of the more gifted and versatile in recent years, with several players who could succeed in the NFL at multiple roles and positions. To sort it all out, Doug Farrar of Sports Illustrated and Greg Cosell of NFL Films and ESPN's NFL Matchup bring their tape notes and break down all the big names -- USC's Leonard Williams, Washington's Danny Shelton, Missouri's Shane Ray and Nebraska's Randy Gregory among them -- and some lesser-known prospects you might not be aware of. This is a must-listen, especially for those who believe that the NFL has become more scheme-versatile on defense than ever before.