Isn't Nat the Back Up Center?

The offensive line played well yesterday, and in landend and landin played really well. And so we're confident in nat being the back up center. Ah, you know, again, any time you have a couple penny leaves, you're going to want those plays back. So that's why his grade was what it was. But other than those couple plays, i thought he did his jobaand did a good job.