As of right now, the battle for next year's quarterback spot is between Lee, Green, and Martinez. Right now I'd have to give the realistic slight edge to Lee and Green because they both saw PT last year (Lee with the most, of course) and they both have the most experience with the playbook and the most experience using that playbook in real game situations.
I don't know much about Jamal Turner's capabilities, but he appears to be an ESPN 150 guy and a four star, so he must be showcasing some good things. He also has been receiving interest from Oklahoma. Carnes, I don't much about the kid so we'll have to wait and see. But, a guy that we had to fight WKU for kind of makes me wonder just what he brings to the table. Not to say that who a player gets recruited by designates how good they are, but he was a rather late addition that seemed to be one of those "he's available so lets just grab him" guys.
I think looking past this upcoming season, your realistic quarterback fight will be between Green and Martinez. Carnes will have an edge over Turner because he'll be here for fall camp, but Turner seems to have a lot of potential under his belt.
Just going off of past experiences and example, I don't think anybody other than Martinez or Green has a realistic shot at the 2011 starting job. I foresee a Jamal Turner redshirt unless injuries happen, because Green and Martinez will figure to be two very capable guys.
I know I left out Spano, but I just don't see the kid getting significant. I think injuries have sidelined his progression and we still don't know what he's fully capable of because he has yet to be 100% healthy.