Several of China guards including those that played in that game have upwards of phenomenal js. I can't mention to people which ones have legendary. Jr is low though (12 Jr is still considered low, so I'm not implying they have below 10).
Yes, and after analyzing a B3 championship run several seasons ago, I (and many others agreed with me) that the winner of said B3 couldn't be stopped either with M2M or 2-3 defense. His guards had JS of 18+ and they shot a lot more instead of driving when facing 2-3.