Xinglu
Black Belt
Sensei Cherlyn Kuoha (Grandmaster's oldest daughter) was given her Black-Belt (on the spot) by Professor Chow after knocking another BB out while sparring. She was 15 and I think an orange or purple belt at that time.
He literally stepped over the downed blackbelt and told her she was to be promoted immediately.
Pretty cool I think-
I think that is fair. If you can consistently dominate and in this case KO a BB in your system... then hey, why not.