I don't think he's getting punished for fumbling, he's not playing because he hasn't done well this season so far.
He is still averaging 4.5 YPC so I doubt it, its obvious that it is because of the fumbles. Since he put it on the ground in the UGA game he has had one carry. CNS doesn't accept fumbles, which is why we probably won't see Alley for the rest of the night.
I think LSU will win by at least 21 --- but the early turnovers and lack of an early running game are disapointing.