I fully expect there to be a 1B. There's been a 1B in every QB competition since GMac landed the job. I would point out that 1B was once a redshirt freshman, he's not afraid to put someone inexperienced out there if they have done what they need to do.
The main complication is the magnitude of the USC game, but I think the plan will be to have a second guy ready to go in either case. To illustrate the difficulty of starting Bateman. You go with him because he shouldn't be as likely to make mistakes, but what if he can't put up enough points to pull away? Is that going to win him the job? The other tricky thing is where Hurts is in this, if he works his way to #2, this could push #3 out of the picture and make it about whether or not to take the redshirt off.