Re: Fatal Flaw?
The two main examples that seem to be repeatedly cited as an example of this Main Character not being the Protagonist theory are Red in Shawshank and Boo in Mockingbird.
Since both these movies are adapted from prose fiction (short story and novel), might these characters functioning as narrators in the movie not just be a consequence of the screenwriter trying to remain faithful to the source material?
Some examples from original screenplays might better serve in illustrating the theory.
"Only nothing is impossible."
— Grant Morrison