Don’t you think the step back that you see is because of the OL play. There are no holes or creases created, not even on the backside which is where they are supposed to be in this offense. I’m sure you and many of the countless experts on this site know that of course. Much like Barnett’s internal clock is racing because he is not comfortable with that OL and KB would not call quick game while he was in.
If Cronk bounces outside, which he has started to, there is nothing there because the OL do not climb and the WRs don’t block.
But yeah putting a different back there would make a difference. GTFOH.