Bad answer. Although McKelvin didn't play the ball well, at least he was with his guy. Besides, DBs have little to do with beating Tom Brady. The only way to beat him is keep him off the field and provide SOME pressure from the front 4 when he is on the field.
Put another way, even if we had Deion Sanders on one side and Charles Woodson on the other, Brady would do what he does unless there is some pressure on him. Brady will light it up this weekend.