Oh, they actually didn't bother to code in mouth swapping for Normal Sonic, and just hid the other mouth mesh by the bone. But for Super Sonic they didn't bother to code anything to hide either mouth by bone. Even thought they use Generations Skeletons so putting them into Sonic Generations they work perfectly as intended. They just screwed it up. And they call for Sonic animations in the Super Sonic Files. Super Sonic uses Sonics animations for anything he doesn't already have animations for. Thats why his quills went downward. It was just pure laziness.