ESPN's Mike Greenberg thinks the Steelers are close, but need one thing

ESPN's Mike Greenberg thinks the Steelers are a quarterback away from being a Super Bowl team. Crowley doesn't think he should say that given Greenberg also thinks Mike Tomlin does more with less and the roster isn't great. Dorin countered that most if not all teams are a quarterback away. Would Mahomes win nine games on the Panthers?