I think that in today's world of MMA, any fighter whose grappling art is BJJ is going to be at a disadvantage unless he is world class (ie. Maia). There are exceptions, but for the most part the UFC is dominated by fighters with a wrestling base. I think the reason for this isn't the octagon vs. a ring or anything like that. I think the reason is that BJJ is every above avg fighters baseline. Even great wrestlers must know BJJ sub defense, even if they can't sub anyone themselves. I think the Gracies were successful with their campaign to get BJJ to where it is today, because in order to even hope to be a great MMA fighter you must know BJJ. With a few exceptions though, I don't know if we will ever see the majority of elite level fighters using BJJ as their primary grappling martial art. Thoughts?