Against SCState, he got the start. He got 2 early carries and did well. He was taken out (possibly for normal RB rotation/rest). He said something to Spiller about being taken out - boom - back in the doghouse.
Why else would he have started and then been yanked out mid-game?
Coming in and trying to establish his standards and dominance in that RB room. Lyn-J is obviously 3 years deep into Elliott’s method of coaching them, and isn’t adjusting well to some of the changes that CJ is making. It’s not unusual for this to happen, they just both have to be mature about it (especially Lyn-J) and communicate with each other.