I know who the different people are and how the different organisations begun but what I don't understand is what each different organisation defines their bjj as. What makes a Gracie Barra gym different from an Alliance gym apart from the name. To me it seems more dependant on the particular gym/instructor rather than the organisation. The main exception to that rule is that Gracie Jiu Jitsu gyms directly affiliated to Royce, Rorion etc tend to be very old school and traditional. Direct Carlson gyms (not including DLR gyms) tend to be very top orientated. So in general these organisation battles make little sense, where as battles between schools do make sense.