Armed with the knowledge that All Pro tailback was Anthony Gose Jersey ticketed for free agency, the saddled up their workhorse for the seventh-most carries (436) in NFL history last season.The were steeped in the research of exce sive single-season workloads -- such as the "" popularized by Football Outsiders -- but opted to sign the 2014 Offensive Player of the Year to a regardle s.Coach Chip Kelly understands his won't be enough to stave off the injuries and regre sion that have haunted backs of Murray's statistical profile."I think there is ," Kelly told The MMQB's Peter King this week. "But how Preston Tucker Jersey do you manage him going into a season?"Our plan all along was to get another running back with him. I wanted to have two running backs, and that's why we got Ryan Mathews . I don't think you can have a guy carry it 370 to 400 times per season and be succe sful. We're going to run it a lot -- we always do -- but we'll have more than one guy doing it."It's an astute approach to utilize Mathews as the "Robin" to Murray's "Batman," allowing the twin downhill, to tag-team opposing defenses with little to no dropoff in production.In fact, the has repeatedly toyed with the idea that Mathews might just be the more productive of the two backs in Kelly's offense.Consider the following:What can we draw from that data?As a general rule, running backs who fit Murray's profile suffer from disappointing production and/or injuries the next year. Even in the best-case scenarios, the player stays healthy, but still sees his effectivene s wane as Brian McCann Jersey a more pedestrian runner.Murray's background offers two additional concerns.Prior to last season, he was a fixture in the trainer's room, mi sing 11 games in three seasons after an injury-prone college career at Oklahoma. Because he's a heavy-contact runner, Murray will always be susceptible to the a sortment of knee, ankle and foot i sues that have hounded him in the past. Aledmys Diaz Jersey Look no further than that dubious medical history for the ' stance that Murray was .Perhaps just as unsettling, Murray was not the same explosive physical force in December as he was en route to a record-breaking seven consecutive 100-yard rushing performances to open the season. The numbers bear that out as well: Murray averaged 3.9 yards per carry in the final five regular-season games after topping the 4.0 mark in every game from Weeks 1-11.The will enter the season with an emphasis on via a dominant ground attack featuring Gerrit Cole Jersey Murray, Mathews and .Murray was a great player in 2014. The concern is not that he to Dallas' road-grading offensive line. It's that he will be outplayed by a fresher, more resilient Mathews in a tandem attack.The latest Podcast and kicks off a week's worth of spectacular fantasy insight.