I'd say rather that BJJ is a big country with lots of room for different people to have different focuses. I train under a Carlson Gracie lineage, but my personal approach to BJJ is pretty close to what Rener and Ryron preach. Some of my friends and training partners take a very different approach. We're all still doing the same art.And this might sound silly but I view a Gracie Academy and their brand of "Gracie Jiu Jitsu" as a separate rank and art from BJJ as a whole. But that's just me in my own brain so take it for what you will.