What sold me on Gracie Jiu-Jitsu was how they approached these endless arguments.
They just simply challenged you to fight. They had an open challenge, made famous in an article on Rorion Gracie in Playboy magazine, in which they would pay anybody $10,000 if you could defeat a Gracie in a no rules bare-knuckle fight. The challenger didn't have to put up a dime and had nothing to lose except his pride. In those days, late 1980s and early 1990s we had challenges come in from all martial art styles. Every single one of them got their ass handed to them. The Gracies revolutionize martial arts and now if you don't have a grappling background you have no chance.
This Roast Beef guy can make all the claims he wants and tell us his styles and qualifications and ranks, but what he won't do is actually fight a legit Jiu-Jitsu black belt. It's not hard to do. A legit Jiu-Jitsu Black Belt is always willing and able to throw down. Unlike traditional martial arts where they always preached walking away from a fight and being a man of peace and all that yin yang baloney, not so with the Gracies. Insult them then be prepared to fight. They never made any bones about their belief that the whole point of martial is to be able to fight and to be ready to fight. There are other things you can get out of training because for most people training in martial arts they rarely, if ever, get into a real fight, but they never lose sight of the fact that martial arts is about fighting.
The Gracies developed their style, which is different from the original Jiu-Jitsu taught to them from the Japanese, by actually fighting. Both in the dojo and in the streets or beach.
And they have been fighting for real for generations.