Is the irony lost on anyone? The Steelers’ glaring hole is incapable of opening one. A hole, that is. The patchwork offensive line was somehow good enough to help win a Super Bowl. It didn’t hurt to have the league’s best defense and a gutsy quarterback who’d sooner take a beating than give up on a play down field. Where a passerby may assume that the champ’s offensive line contributed greatly to success, a studious…

