Writers David Boclair and John Glennon of All Titans at SI.com and former Tennessee Titans cornerback Denard Walker try to make sense of Warren Sharp's ranking of the NFL's Defensive Front Sevens, in which the Titans -- with Jeffery Simmons, Denico Autry, Harold Landry, Bud Dupree and others -- barely cracked the top 20. The trio also looks at which of Tennessee's position groups are the best and which are cause for concern as the start of training camp approaches. Also, the panel pays tribute to former Titans cornerback Jason McCourty, who recently announced his retirement after 13 NFL seasons, the first eight in Tennessee.