Ohio State has its worst defense of recent years especially in the secondary. Alabama has its most explosive offense ever, which is saying a lot. This combination is enough for the Crimson Tide to defeat the Buckeyes by double-digits and cover the spread. 
Yes, the Buckeyes have an explosive offense, too. I would take Justin Fields over Alabama QB Mac Jones. The Crimson Tide's defense doesn't have as many dominant players as in the past few years, but their defense still is more talented than Clemson's in the line and secondary. So they are going to get some stops against Ohio State.
I don't see Ohio State slowing down Alabama at all. 
Jones, running back Najee Harris and wide receiver DeVonta Smith were all Heisman Trophy finalists with Smith capturing the award. Smith caught 105 passes for 1,641 yards and 20 TD's. I've watched Alabama football since the days of Joe Namath being under center and I've never seen a Crimson Tide wide receiver have the season Smith had. Oh, yes, Alabama also has the best offensive line in college football even without injured stud center Landon Dickerson. This group is in the discussion for being the greatest O-line in Alabama history. 
Ohio State ranked just 56th in fewest yards per play and that was playing an easier schedule than Alabama. Just last year the Buckeyes ranked first in that category showing what a drop their defense has experienced this season.