Kinda.
It just makes it so that new extra character that was basically it's selling point for some becomes non-existent cause they had to explain why she was never mentioned before or after the game. Everything else with Riku, Roxas, and Axel still seem relevant though.
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Brawl is like ZSS' breasts. Well rounded for casual players
http://ib.skaia.net/image/32143.gif