I would have thought that, if they'd had access to all the FL characters, that FEXL would have...ya know, had some FL characters in it. Instead of just being a straight put of every SFEX character.
Isn't the entire reason the game is called Fighting EX Layer instead of Fighting Layer EX because they don't have the rights to the name "Fighting Layer"? If they don't own the name, I doubt they own the characters.