Considering there was next to nothing in terms of a pass rush(except for Mitchell's sack on the blitz), the cornerbacks did a pretty good job. I know there were many passes completed to wide open receivers and Cutler missed open targets a few times, but he was only 25 of 45 for a pedestrian completion rate of 56%.
That being said, Whitner's play continues to leave a lot to be desired. He wiffed when trying to tackle Royal on the end around and was late getting to the play numerous times. Even his hit that caused the fumble was a lame attempt at a tackle, but he got lucky by the fact that his helmet hit the ball.