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Thank you for saying the obvious ^^I think you all were reading to much into this. XD
Nomura was being a jerk. EVERYTHING is a spoiler in a game. A spoiler is something which is revealed to you in a sense. Zexion's weapon is a spoiler because we don't know what it is, thus if it was on the stone that was broken in KH2, we would have been spoiled and informed what his weapon is. Just because it's not an impact on the story doesn't mean it isn't a spoiler.
That's the whole point. Now that you know what Zexion's weapon is, there is no mystery and the spoiler is gone. Get it?