Alabama should have at least one defensive starter next year, Bobby Greenwood who turned out to be probably the best freshman recruit from last year. He should start on the defensive line. I think another white defensive lineman may also start or see extensive playing time.
Corey Reamer, a safety, saw some playing time as a pure freshmen last year before he was suffered an ACL injury. He was the MVP in Alabama's championship 6-A game a year ago where he played cornerback. Not surprisingly, he wasn't highly recruited. If he comes back full strength he should see a lot of playing time.
Regarding this year's class, I like Andy Davis, a saftey a lot. He played high school football for 4 straight years and is reported to have blazing speed. In fact, he may play on the special teams as a kick returner. I believe Southern Cal also recruited him.