I would hardly call any of their wins more impressive.
They played 3 ranked teams and won by a combined 20 points (1 against Texas A&M, 12 against Texas, 7 against Kansas St).
Alabama played 6 ranked teams and won by a combined 93 points, including their 3 point loss to #1 LSU (16 points against Penn St, 24 against Arkansas, 28 against Florida, 3 point loss against LSU, 28 against Auburn).
Again, Alabama has not played a close game all season except LSU. No other team can claim that except LSU.