Gary Kubiak's zone-blocking system is designed to be a running back's dream. It's designed to make 1,000-yard rushers out of players such as Justin Forsett and Steve Slaton. And Reuben Droughns. And Mike Anderson. And Olandis Gary.
It's designed to create holes, for split seconds at a time, as the offensive line migrates to one side and pulls the defense along for the ride. It's designed to give backs options, and most are able to pick one and capitalize.
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Montee Ball, the Broncos' 2013 second-round draft pick and former starter, has struggled to do just that.