/stats <username> shows the highest rank in that belt; it's qi ranking (the old ranking system seen on usercards and such).
So say you have 1999 qi, you'd be rank 1 in the black belt.
If you had something like 9999 qi, you'd be rank 1 in 9th dan.
When you upgrade to the next belt, your rank decreases because you are now in the 10th dan ranking (ie. you'd have the lowest qi out of all 10th dans and therefore have the lowest rank).
TIcux and Tripstone are both rank 1 because TIcux has the most qi out of all custom belts and Tripstone has the most qi out of all God belts.