Pretty much. They hold them to a three and out even at that spot on the field, and they may not have tried what would have been a very long field goal try. Instead, they end up giving them a first down inside the 30. Defense couldn't make a stop when they needed to, simple as that.
So if they gave up one first down and then punted the Steelers would have gotten the ball with a chance to TIE instead of being down 10. Onside kicks are the lowest percentage play in football, we haven;t converted one in 11 YEARS, Tomlin again **** the bed in the clutch, its what he does .