Yeah, seems feasible, which makes me believe that on older 3DS systems, too many of them would cause FPS drops. That's a bit of a shame. It does make me wonder why the two versions needed to have the exact same roster, but I guess having different rosters would have just annoyed people even more. You know, "why is ridley only on wii u, i want to fight him against goku on 3ds ffs" and stuff.
Also this.