I'd just like to say that this is an awesome discussion. Brent, as someone with as much experience as you, its refreshing to hear your discussion points regarding gi vs nogi. I think that sometimes, no disrespect intended, people in the 10th planet system lose sight of how different gi vs nogi can be if you only exclusively train nogi, especially the more advanced you get. I will say, however, that plenty of nogi world champions are not exclusively training nogi all the time. In fact they train primarily gi, and then when its 'nogi season', they spend less time training as much gi and focus on being sharp without it on. Marcelo is an exception to the rule from what I see, but I correct me if I'm wrong. I've had the chance of training with and learning from a few guys who have medaled at the world or pan am level in gi and nogi who are either blues or purples. Although clearly they had one style they were better at (gi or nogi), for the most part, they came up doing mainly gi, then transitioned into embracing some nogi, and essentially applying very similar principles that they used in gi (ie, cross collar framing in gi is changed to grip on the trap to frame and set up attacks) into their nogi game to be successful. Darson Hemmings is a guy I've watched and learnt from who actually started with nogi, but as he got better he would apply gi techniques (ie. playing nogi spider guard, etc) to nogi grappling with incredible success. He has now transitioned into the gi realm, has only been training in the gi for a short period of time and has been medaling everywhere including winning the brown belt pan ams at his weight.
So personally, and my white belt opinion doesn't hold the greatest weight (but I figure I should say something definitive), I think if you do gi or nogi, at blue and max purple, overall your rank should automatically be recognized in both areas, but as Kurzy had mentioned, if you are say a brown belt, but have focused exclusively on being ranked in nogi only, you should be playing catchup because you earned a jiu jitsu black belt rank. Now I fully understand the situation people like you and Sean and Cade are in and I respect that you are trying to be students of the game. Maybe at the higher levels, if you have earned an exclusively nogi bjj rank, training in gi at a lower rank might make sense because of how different things are and the fact that you have treated them like two different arts, which in your development, they have been.
I hope nothing I've said has been disrespectful, I just really enjoyed reading what most of you had to say and wanted to chime in. Just for some background on myself so you know I'm not just trying to keyboard warrior it up, I began training exclusively nogi and have tried to play catchup in the gi to ensure that when I'm promoted I can represent my team and instructor well in both. I compete regularly in both to stay sharp, so I have some idea of what Brent is talking about, just obviously a white belts understanding :P
ps- Brandon, your theory on bringing a white and your current rank when visiting schools to be respectful is actually awesome.