I just came across a passage in the Dramatica book that suddenly has me confused (I've read it several times, so am not sure why it took this long for me to get confused by it).
In the section "Storyforming Structural Story Points" you discuss how the main and impact characters function in the OS throughline:
In the Overall Story all we see are the characteristics they represent in relation to the other Overall Story characters.
So if your Main Character happens to be the Protagonist as well, then it is purely as the Protagonist that we will see him in the Overall Story. If your Impact Character is also an Archetypal Guardian, then his helping and conscience are all you should consider about that character in the Overall Story.
And a bit later:
The importance of the Main Character and Impact Character to the Overall Story is completely in terms of the Overall Story characteristics assigned to them.
That is the only reference in the book to "Overall Story characteristics," by which you seems to mean "motivation" (the Guardian's help and conscience in the example above).
Why only motivation? I can well imagine that a character's methodology might well be an issue in the OS throughline.
Perhaps I'm misinterpreting this?