Callahan seems reluctant to redshirt many players, especially defensive players. I image that he will redshirt both Lee and Witt. As he uses Keller, Ganz, and Davis as the emergency third string quarterback. It is hard to tell how the running backs will be handled. With Lucky and Gleen being banged up this fall and Culbert not having much experience yet at back. I image we will see two freshman out of Castille, Helu, Mendoza, and Prince in the backfield.
I don't think we will see either of the lineman (Jones, Burkes) play this year. Nor do I think that Hill will see any time at tight end with four guys ahead of him. We might see Paul get some action at reciever as Callahan has shown that he likes to rotate in about six guys or more during a game. I don't see CG or Hagg getting any action unless they impress enough in the return teams to see some action.
Defensively is where there could be some players see some action. I don't see Moore, Crick, or Yancy seeing any playing time this year unless one can excel as a pass rushing specialist. As far as linebackers as concerned, I see Lawerence and Washington getting time on special teams and seeing mop up duty as well to develop depth not only for this year but for next year as well. I don't see Stafford playing this year.
Secondary will get to see quite a few freshman this year as Blue has been turning heads in camp as well as Prince, if he stays on defense. I am not sure about Sullivan but he might make some coverage teams if he gets used to the speed of the game. I also expect Adi to be used this year as well.