You can score on Bama. That's been shown and OSU is more than capable of twelving with the Tide.
However, the problem is that their offense has no weakness.
Good defenses attempt to make offenses one-dimensional. It's sound and usually doable. With Alabama's offense, due to their offensive line, they:
a - probably cannot be made to be one-dimensional, AND
b - would probably beat you by being one-dimensional by EITHER just running or just passing
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You want to blitz them to defend the pass? Their OL blocks, they have an uncoverable WR, and 2 others who are very good, and a RB who can catch the ball. Jones gets rid of it quickly.
You want to drop 8, Jones has all day, and nickels-and-dimes you. Arkansas did that, and the Tide scored 52 points.
You want to shut down the run - their OL runs you over anyway and their NFL RB still gets 100 yards, all while the passing game SHREDS you. The couple of games Harris was slowed, the backup RBs yielded a total of over 100 yards and a very good ypc average.
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If you told me Ohio State scores 45 points, I'd still only give them a 50% of having won the game. And that's sick.