A flashback shows young Erwin's father theorizing that the government altered humanity's memories. His father's subsequent "accidental" death at the hands of the Military Police fuels Erwin’s lifelong quest for the truth.
It clarifies how Titan Shifter powers are transferred and introduces the concept of memory manipulation within the Walls. 3 : Old Story
“Historia just became so much more important than Eren.” Inverse · 7 years ago A flashback shows young Erwin's father theorizing that
It reveals her tragic childhood on a farm, her mother's rejection, and the moment her father, Rod Reiss, appeared only for the Military Police to murder her mother in front of her. “Historia just became so much more important than Eren
It successfully transitions Historia from a side character to a central figure, arguably making her "more important than Eren" at this stage of the story.