On defense, if Kirpatrick declares, they'll lose their entire secondary except Lester. If Hightower declares, they'll lose him, Jerrell Harris, and Upshaw. Johnson and Mosely will be back. So mostly new linebackers. I can't name any of their D-Linemen so no clue there. Both starting receivers and one tight end are gone. Fluker is rumored to be leaving and Vlachos is a senior, but Barret Jones is staying (unfortunately...that kid is a beast). I don't know who their starters are on the OL, but they have recruited extremely well there. They're expected to lose at least 7 on each side of the ball, FWIW.
That's a lot of defensive beef to lose. Bama will be good, but they're not blanking anyone next season.