There is a difference between the Main Character the Narrator and the Main Character the Main Character Throughline perspective.
The storyform is not a real thing – its an narrative applied to “reality.”
The Main Character the Narrator is a function of Story_telling_
The Main Character the Throughline Perspective is a function of Story_forming_.
The Narrator can know everything because he’s the Narrator, he’s not hindered by being in the same Player that holds the Main Character Perspective of the storyform.