i'm not really for playing Barnett simply because of age and experience. I think this would be a mistake. Cornwell appears to be in the doghouse so i'm not sure that it is relevant to discuss his possibility of starting for the first game... so we're really talking about the other 3 guys.
Coker has problems with accuracy that don't appear to be changing. that's not the kind of consistency you want. He is, on the other hand big, durable and somewhat athletic. He could give the offense some different dimensions with his size and decent running speed. I like his form and throwing motion but his pocket presence is just weird. He never looks quite comfortable.
Morris seems relatively average in all aspects of play... which could be a good thing with the idea that he won't lose the game for you. flipside is, he is unlikely to go out and take a game back from a team that is beating us.
Bateman is and has been termed the most athletic of the bunch which could be a big asset early on in the season with a newly gelling o-line. He looks quite comfortable in the pocket and his size is good. He has IMO the best throwing mechanics of the bunch or maybe tied with Barnett on that.
I think any of the three guys could be winners for Alabama. Coker is higher risk but also higher return (because he can throw it real far ). Coker may cost us a game or two if he gets on one of his streaks of throwing to the other guys. Morris is the safe bet to run the team without doing stupid crap at the LOS. Bateman is a risk due to lack of game experience and i'm sure the coaches have other reasons for not choosing him up to this point.
RTR.. one or more of these guys is going to spank some badger tail.