re: Jalen Hurts it is...

I think Kiffin is one of the best in the business. If he says Hurts can start, I wouldn't question it much.
As for Saban, I think if Hurts screws it up, he will put in the older guy and not ask him to do much.
Regardless, your team is loaded with talent, Kiffin is good enough to hide his weakness, you should be fine with whoever you roll out.