I double teamed this past season on a Lv 3 lg coed and the 5 boys did unassisted Libs at varsity and USASF competition and no penalties were given so it definitely is legal. Scoring wise I have no idea but in guessing it will score higher since the difficulty of doing an unassisted lib (the highest unassisted stunt skill you're able to do in lv3) is much harder than a group lib. Plus, the more stunts you put up, the higher you score in stunting.