I agree with Wolf Kanno. Utilizing ghost cards of "top players" at the arcade would really increase the drive to play this game in the arcade.

Maybe they could actually print the "ghost cards" onto a real card that you can use that could store your characters data, the same way Initial D Arcade Stage does. And they could sell ghost cards of other characters.

I do think they'd have to add a few more characters for the official arcade release, to make up for the lack of most of the game content.