I would venture to say that the absence of Clowney will not make a significant difference in their defensive statistics or the w/l column by the end of the year.
Just curious, but do you actually know who they have returning? They lost 3 if their starting 4 on the DL. Clowney was a difference maker in our game. At times, we could not block him. They also lost both CB's, and it will be interesting to see if they can get good play at that position. Their offense should be good, no doubt. But I believe USC will get scored on much more this year.