With any of these polls, ranking the top teams of a conference highly becomes a self-fulfilling prophecy. If teams A, B, and C, only play each other and then a bunch of powder puffs, of course they will end up with at worst two losses against "quality competition." And odds are one will emerge above the other two, thus "proving" the early rankings. It isn't just the Big Ten, it's college football in general. But yes, most years the Big Ten is a house of cards, leaning on preseason fallacies to prove the champ deserves the hype and big bowl...
Ohio State will have a hard time finishing outside of the top ten, simply because of how their schedule sets up. How many games can they realistically lose? 2? 3? And then they'd still be one of the top teams in their conference, with losses to "quality" opponents.