When guys execute scripted plays work well.
But all the script does is give you a starting point for your play calling and it lets the offense start comfortably to get into a rythm When you get into certain situations you abandon the script though.
Kubiak has mentioned "abandoning the script" before because of penalties or some other loss if yardage or no gain.
I think the first drives are still scripted. I just think that the offense in general is executing well on those drives.