When you have one of the worst defensive lines in football and you insert three pro bowl players, it's bound to improve. Those additions have not gone unnoticed by Chris Wesseling of NFL.com's Around The League. He says the Raiders defensive line is the most improved position group in the AFC West.
Tuck replaces Lamarr Houston who was the best defender on this defense last season. Tuck is older but offers a lot of pass rush even at this stage of his career.
While the Denver Broncos continue to pull away from the pack, their secondary takes a backseat to the Oakland Raiders' defensive line for most improved position group.
Really the only other position group on any team in the AFC West that could also be considered was the Broncos' secondary. They signed safety T.J. Ward along with cornerback Aqib Talib. Although those signings are somewhat off-set by the losses of Dominique Rodgers-Cromartie, Mike Adams, and Champ Bailey.