It's obvious that the reason the defense is playing better is because they are running the ball so many more times and they get rest . There is nothing worse then playing d on a 14 play drive giving up points and then you offense throws 3 times and goes 3 and out and your back on the field in less then 5 min . I don't think tebow is your prototypical NFL qb , but he manages the game and keeps the d fresh , and that is why the defense is playing so much better . And that is why they are winning .