The addition of Rico Dowdle to the Steelers' running back room provides a thunder-and-lightning dynamic that should help the offense's transition to Mike McCarthy's system. What's more, the Steelers might have one of the toughest running back duos to tackle.

Dowdle comes to the Steelers coming off a season in which he averaged 3.2 yards per carry after contact, which tied for 30th among qualified rushers. Now add Jaylen Warren to the mix, who averaged 3.9 yards per carry after contact, ranking fourth in the NFL, and that's a dynamic duo. In addition, according to FantasyPoints.com, Warren ranked sixth in the NFL in missed tackle rate and Dowdle ranked 15th.

How the workload is split between the two has yet to be answered. Dowdle played for McCarthy for all five seasons the new Steelers' head coach was in Dallas. McCarthy's offense in Dallas ran inside zone more than any other concept, and Dowdle just happens to excel running inside zone. Last season with the Panthers, he averaged 4.5 yards per carry with a 46.5% success rate running inside zone concepts. He's an easy plug and play.

This paves the way for Warren to go back to a role that helped him break out in the NFL. Warren's role on third down was drastically reduced last season with Kenneth Gainwell in the mix. Warren is both an elite pass protector and a dangerous pass option out of the backfield. He can also spell Dowdle at any time, making it a true two-headed monster.

This takes nothing away from what Warren and Gainwell accomplished. They were the only duo to each exceed 1,000 yards from scrimmage last season. But with Dowdle, the running back duo is back to being a bit more dynamic.