@BigRedBuster I might be wrong, but I think the link to less production was partly due to the inside-zone they run. I am a big advocate of giving RBs more opportunity to the edge and in space. I know it doesn't always produce big plays or success all the time. But it does give them an opportunity to use speed and cutting ability, more than running between the guard and tackle, or guard and center all the time.
Seems to me that the outside runs are for duck-r guys only, or WR in this offense. Or QB option plays. A majority of those option plays involve WR.
In other words, I can see more RB production if we mix it up more often (inside & outside). The big runs we had with RBs were due to bouncing it outside instead of going into a pile of lineman.