Today, most of the top running teams in the NFL use a zone-blocking scheme that requires the offensive lineman to block an area, not a specific man. Among them are Kansas City, Washington, Denver and Houston.
Bicknell used a zone-blocking scheme last season with the Chiefs, who finished fifth in the league in rushing after leading the NFL in 2011. Bicknell said the Chiefs used a zone-blocking scheme because they had a running back, Jamaal Charles, who liked to run outside-zone plays.
If the Steelers change to a zone-blocking scheme, then it will be imperative to find the type of running back who is patient, stretches the play and has good cutback instincts.
Right now, the Steelers' top running backs, Jonathan Dwyer and Isaac Redman, are physical backs who run inside and are more tailored to gap runs in a man-blocking scheme. Rashard Mendenhall and Chris Rainey are examples of running backs who can threaten the edge and are more suited to zone-blocking schemes. But Rainey is already gone and Mendenhall is expected to follow.