I just realized they based this game off my idea! Final Fantasy Disidia. A few years ago I made a thread that Square should make a game combining charactors from all the Final Fantasy's and put them into one game thats a tournament type battle with a story to it. My orgiinal idea since x-2 was the latest, and blitzball actually used charactors, not cards, based off that, then changed to a battle type. And here it is! I think they went here, saw my idea, and went from there.

Heres the link to my original thread so you can see.
Click Here
thats were my idea originated from since at the time I liked blitzball... then I thought maybe battles w/ same concept.