Richt seems to have no plan.
He was using Yearby as our short yardage back against ND. 4 of his runs came on - 1st & goal at the 2, 2nd & goal at the 4, 3rd and 1, and 4th and 1. Why would those be the situations where Yearby was used?
Add to that, Walton is still get the majority of the carries, and Gus was 1 carry then out of the game whenever he did get in.
There appears to be no rhyme or reason on the RB rotation, and no awareness of what RB should be used based on the game situation.