Steelers defensive linemen learning on go

At some point, Steelers coach Mike Tomlin must come to grips with the inescapable reality that his aging defensive ends, Aaron Smith and Brett Keisel, aren't the impact players they once were.

It could be argued that Tomlin and general manager Kevin Colbert began looking toward the future two years ago when the Steelers plucked Ziggy Hood off the draft board with the 32nd overall selection. Then, with the 31st pick this year, the Steelers opted for Cameron Heyward.

Hood and Heyward appeared worthy of the Steelers' first-round investments even as the Steelers struggled Sunday night against the surprisingly stubborn Indianapolis Colts en route to a 23-20 victory at Lucas Oil Stadium...........

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