I think GJ is more powerful than YG. Well, it's true YG is smart/ talented and all that but hey, he is crippled!! that's his one major disadvantage!! And GJ on the other hand has more years of practice/ experience and he has more knowledge/ experience of nine yin manual.. plus GJ was already on great's level when YG didn't even start studying martial arts.. so by the time when YG reached the great's level, it would be stupid to assume that GJ hasn't made any progress!! It doesn't make any sense..