Rhythm is a bad choice of words but from being a RB myself things change and develop during a game. You can also wear down the D as well. SO there is some truth to this theory just bad choice of words.

Ingram on the other hand isn't the RB I think we hoped for... maybe more of a FB type back but not the RB. He had flashes when Ivory was cutting into his carries and it looked like both of them were competitive with each other to get the carries... as soon as Ivory was hurt you might as well have benched Ingram as well.