Yes, Knight, “eventually all the throughlines will be put into scenes” where they overlap and intermingle with elements of the other throughlines — just like cooks using recipes that mention flour, sugar, eggs and milk solids have overlapped and intermingled these ingredients into many a great cake.
Using that analogy, the benefit of Dramatica theory is that it helps you make sure you’ve got enough of each ingredient so the eventual cake tastes just the way you want, and that it will hold up under the examinations of many other cake eaters (or story viewers, in our case).
For example, by forcing you to look at the MC throughline as distinct from the OS throughline (though they will ultimately intermingle), Dramatica theory helps you show the audience the Main Character’s personal perspective as distinct from the Overall Story’s detached-and-objective perspective.
This gives your audience that delightful experience of seeing the same event/s from two different perspectives! And of course Dramatica will help you also give your delighted audience the distinct perspectives from inside the Impact Character’s head, and the shared perspective of the MC and IC in relationship, as they work through their varying interpretations of these same events.
Your audience will get a delicious “cake,” where they can sense the nuances of the multiple ingredients, but also enjoy how they co-mingle into a scrumptious combination with a satisfying end.
Study some of the Comprehensive Analyses on the Dramatica.com website — http://dramatica.com/analysis/comprehensive. These in-depth write-ups will help you start seeing how the four throughlines should be distinct, yet also how the story-writers cleverly overlapped them.
In many cases, the Comprehensive Analysis consists of a podcast or videocast of a Dramatica Users Group, discussing a movie they have just watched. You can see the list of the recent videocasts here: http://dramatica.com/video/users-group.
So pick one of those movies, and watch it. And as you watch, keep the four throughlines — OS, MC, IC and RS — in mind. Your “taste” for the four will quickly become enhanced as you watch how they are distinct yet still intermingle.
Finally, go to the videocast for the movie you just watched, and you will be able to watch and hear as a group of Dramatica users (led by a Dramatica expert) reach a conclusion of how that story set up its four distinct throughlines, but also wove them together into “a scrumptious combination with a satisfying end.”