On his runs of 27 and 41 yards, Davis had huge holes that most of us could have run through for close to the same yardage. On the run of 27 yards, he was tackled by the first guy to touch him. On the TD run for 41 yards, he was never touched.
Much of DD's problems this year have been that he can't break tackles. Good running backs are able to run thru or by the first tackler, or at least when they get tackled by that first man it is only after they get an extra couple of yards. This year DD needs an open hole to get 4 yards.
Remember in the Green Bay game when DD got through the hole and was one-on-one with LB Nai Diggs? Diggs was able to wrap up DD and stand him up. Good (not great, just good) RB's are able to at least keep their legs going and dive forward after contact.