Well... it’s because it’s a console based costume that you only could get by buying the digital deluxe edition. It’s not a regular dlc costume like the rest.
I don’t think Momiji necessarily makes it better. For the few Momiji mains it does, because we mained her. But for others? Not so much. She and Rachel should’ve been in the game since launch if TN was gonna add them later down the line anyway. I’d rather see new dlc characters instead of...