In a span of three years, the Steelers used two No. 1 draft choices to bolster what they thought was an aging defensive line.
In 2009, after beating the Arizona Cardinals in Super Bowl XLIII, they drafted defensive end Ziggy Hood with the 32nd overall pick. And, in 2011, after losing to the Green Bay Packers in Super Bowl XLV, they drafted another defensive end, Cameron Heyward, with the 31st overall pick.
The intent was two-fold: To inject some youth into a line that had three starters, not to mention its top backup, over the age of 30. And to rebuild the front line of the defense with eventual replacements for Aaron Smith and Brett Keisel.
Four years later, the Steelers are still waiting for those top picks to have a significant impact on their defense. And the time for them to do so likely is here.
The Steelers likely will lose the anchor of their defensive line -- five-time Pro Bowl nose tackle Casey Hampton, who is not expected to be re-signed despite starting all 16 games in 2012. He will be the second piece of what defensive coordinator Dick LeBeau has called "the best defensive line I've ever coached" to depart in as many years, joining Smith.
The lone holdover is Keisel, who will be 35 in September but is coming off one of his best seasons. He had 41/2 sacks -- all in the final eight games -- and led the team with a whopping 40 quarterback pressures, more than double any other Steelers player. But Keisel likely will be the only player on the defensive line who is over 30.
While other units of the defense are showing signs of age, that won't be the case on the defensive line.
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