First of all, there are actually FOUR POVs in Dramatica—one for each of the throughlines: Main Character, Impact Character, Objective Story (where the Protagonist and Antagonist do their stuff), and the Relationship Story. The Main and Impact Character POVs are the most obvious source of at least TWO points of view. The Protagonist and/or the Antagonist (or any other character in the Objective Story throughline for that matter) can present even more points of view. The big question is, are the multiple points of view truly different from each other, or are some of them the same “paradigm” but shown through the eyes of two or more players? You can have a Main Character point of view that seems to float from one character to another—the bodies change but their take on the world around them is the same. It’s tough, but it is frequently done, particularly in novels. Another approach is to enhance the main story with substories. Each substory will have its own Main Character thereby adding to the multitude of POVs going on in the work. Stephen King uses this approach A LOT.
Getting inside a character’s head doesn’t necessarily make them the “Main Character.” It’s a storytelling device that works particularly well in novels and not quite as well in films or television. We can do this with ANY character in the work, but there should be some indication somewhere in your story as to who you want your audience to most identify with. If you don’t, you have chosen not to make an argument and the interpretation of the work will be left in the hands of the audience (sometimes this is desired). However, if you ARE trying to make a point and you would like your audience to follow you to its conclusion, then, and only then, should you clearly delineate the four throughlines. Your audience need not be able to identify each throughline from the beginning of the story, but by the end they should be able to reconstitute it in its “true” form.