You have a point. Kevin Minter, MLB from LSU, declared today after receiving a 3rd round grade from the NFL. However, I think these mock drafts are based off what the teams need but also what they will likely do in FA. Obviously, if the Bears sign a LT, they won't need OL in round 1 unless Chance Warmack falls to them. I think Walter knows the Bears are going to be huge players in the OT market.
BTW, the more I think about it, I doubt the Bears take OL in round 2, unless it's a G. Emery clearly loves Scott and I don't see a scenario in which he's not the RT in 2013.