Defeated in the College Football National Championship Game in January, Alabama suddenly finds itself in uncharted territory: trying to avenge a loss in a trophy contest. It doesn’t happen often in Tuscaloosa. If the 2017 Alabama Crimson Tide intends to exact revenge for its defeat, it will have to do so with serious depth questions on the defensive line, an unknown quantity at placekicker, and an offensive line that has been erratic and perhaps even underachieving for several years.