Nelson, there's nothing wrong with saying, "Technically, I'm a white belt by rank, but have been training jiu jitsu off and on, for upwards of 5 years.". That'll give the coach an idea of where you're at, and throw guys at you accordingly. If you do well with the first guy, maybe he should give you a tougher guy, or vice versa. But, dang if you were rolling guys up, maybe the coach should have recognized that from the beginning, and set you up with the purps. You'd have a fun time learning from them, and they can see where they stack against you(in front of coach). I love the guantlet!