Well it looks like you may be right. Maybe they're releasing them on diff dates for different consoles, or maybe the website hasn't updated all the consoles.
http://www.ebgames.com/ebx/categorie...st&intpageno=2
PS2 Version Ships on 9/30/2004
Xbox Version Ships on 6/10/2004
Gamecube Version Ships on 8/9/2004