I actually think Nathan was supposed to be the "Evil one". Those three should never have been friends or loved each other. They should be on different sides. That is the circle that keeps repeating itself. The three sides they are representing are fighting each other and it all ends with them killing each other or trying to kill each other, "Audrey" going back to sleep and the troubles vanishing for the next 27 years.

Just that this time, Nathan was raised by the sheriff, and Duke never really met his father, and Audrey is a cop. And they love each other.

So this time for some reason they have an actual chance to stop the troubles once and for all, and some people just don't like that...

It's a really fascinating concept if you get down to it.