Perhaps the biggest reason why there was such a large jump for Big Ben is because of one player: Rashard Mendenhall. In 2008 the Steelers didn’t have much of a running game; the combo of Willie Parker and Mewelde Moore combined for just 3.9 yards per carry. In 2009 Mendenhall averaged 4.6 yards per carry, good enough for 7th in the league for players with at least 200 carries. The reason why Mendenhall helps Roethlisberger when he’s under center is because of the threat of the run. Defenses have to prepare for the run or the pass from that formation which means they can’t commit to one or the other. Put 8 in the box and Pittsburgh will throw the ball. Drop your safeties 20 yards from the line of scrimmage and you can expect a handoff to Mendenhall. But when Roethlisberger is in the shotgun, then the defense knows what to expect. There’s no threat of the run so the defenders can just watch the man they are covering or the zone they are occupying and pay no attention to the running back. Take a look at the chart below and you can clearly see when the Steelers spread the field with receivers and take the threat of the run out of the equation, Roethlisberger’s rating recedes like Santonio Holmes’ hairline. Yes the numbers are somewhat ambiguous as related to being under center vs. the shotgun due to the Steelers running multiple-receiver sets while Roethlisberger is under center. But for the shotgun, there is ALWAYS at least 3 receivers in the formation. (In the chart below, receivers are defined as any player split wide or in the slot including running backs and tight ends who are flexed out).
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