In BJJ, you can be rewarded with stripes, based on skills, subs, attendance, bla bla bla;;
Belts vary form school to school. I am belted under royer, and if I was at a school back in canada or the states I would prob be a strong brown, or black;
As for Maia he has some sick skills in a BJJ roll, but has to still improve on sweeps and subs, while getting punched in the face..
Silvia trains with the Nogs, SO his BJJ is world class, it would be right up there..
The gym here in brazil he trains at is known for awsome BJJ..