In the years the MWP, based on the trope "The World As Myth", has operated, it hasn't only looked for worlds where its ACU pilots have counterparts. There's a lot of stuff less glamorous than the "save the underdog humans (or Seraphim)" or "Counterpart Search Slice of Life" missions. For example, cleansing all the Draka timelines where realism didn't stomp them already.