Brad Biggs at the Chicago Tribune answers your questions:
“Why is Jeremy Langford assumed to start at running back? Overall, I thought Ka’Deem Carey ran tougher, caught passes better and blocked at least as well. — @BillMiller1991
“Nothing is locked in at this point but the first thing you should keep in mind is that Langford was drafted by the current power structure at Halas Hall, which includes general manager Ryan Pace and coach John Fox. Langford has better speed and is probably viewed as a better receiver out of the backfield even though he had a couple bad drops last season. Langford was higher on the depth chart last season.”
I think Biggs has the right of it, here. Langford is more athletic and it’s obvious that the coaching staff considers him to be the better receiver and they probably see Langford as being the back that is most like Matt Forte. Carey, on the other hand, was pretty close to having no job at all until he started to become more effective on special teams. Or at least until the coaching staff felt more comfortable playing him on special teams.
Having said that, I think everyone would agree that it’s unlikely that we will be able to expect Langford to be Forte. In this respect, Langford and Carey could make a wonderful one-two punch with Langford being a slightly more elusive and more versatile third down-type back and with Carey being more of a power back.
Should the case it will require that these two back be used differently in 2016. Last season, the coaches were more likely to leave a back in for an entire series before switching up. The Bears might be more comfortable using Carey and Langford alternately down-to-down in specific situations next year, thus taking advantage of their strengths.