Another reason OSU's defense hasn't been great is they've been on the field a lot more this season, due to OSU QB Spencer Sanders throwing interceptions & fumbling it. OSU is tied at #123 in turnover margin at -9 on the season.
Sanders through 7 games this year: 11 TD to 9 INT. In OSU's first three games (@ Oregon State, McNeese, & @ Tulsa) he was 7 TD to 1 INT. Since Big 12 play he hasn't been good.
In the TT game Sanders accounted for 5 turnovers alone. 3 INT & 2 fumbles.
OSU isn't great due to their poor QB play, which is surprising.