Mike Tomlin has spent the better part of the season — actually, check that, the past four-plus seasons — glossing over the Pittsburgh Steelers relentlessly stagnant offense by pointing to the scoreboard. Frustration internally seems to be mounting with each passing week, even with the Steelers (6-4) in the thick of the playoff mix as Thanksgiving looms. Three weeks ago, right tackle Chukwuma Okorafor lost his starting job — likely for good — for popping off late in a listless loss to Jacksonville.