In the four decades that have passed since the glory days of the 1970s, there has never been any comparison to the front four of the famed Steel Curtain defense. And there likely never will be.

There haven’t even been comparisons to the 3-4 front of Aaron Smith, Casey Hampton and Brett Keisel that helped shut down running backs in 2008 and 2010.

But the Steelers think they might have a pretty good three-man line heading into the 2015 season with defensive ends Cam Heyward and Stephon Tuitt and nose tackle Steve McLendon.

Problem is, they don’t have much behind them...........

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