Murray's lowest average in his four years with Dallas was 4.1. He averaged 5.5, 5.2 and 4.7 his other years.
I think it's a silly to think he was going to fall off the cliff if he stayed in Dallas. Now, he wasn't likely to repeat what he did last year, but I don't think it would have been realistic to expect it.
If anyone is expecting any of our backs to produce what Murray did last year, that's also unrealistic. I'm just looking for our running game to prove it can do what we saw last season ... run effectively on first down despite loaded fronts, make yardage when there doesn't seem to be there, continually pick up positive yardage. If we get more bigger runs out of this group than we did last year, that's a bonus to me.