I wonder if there is at least 1 person in Europe who got the unlock key for the full game by buying all the packs. In terms of your case I can only think of the possibility that for some reason special character bundles don't count at all. But this would be ridiculous.
I don't think Core Fighters can be upgraded to the full version at all. You can only buy the 4 packs you mentioned (characters, story mode and musics) to expand it.