I wonder why these "Asian practitioners" wouldn't demonstrate their skills in Pride or another MMA venue over there? What better way to make these things known to the public!
Because they don't -want- people to know what they have, Justin. It gives them an edge. These arts have often been kept as family secrets, not public knowledge. Their existance has most probably gotten out into the Western world by accident, not because the Asian possessors of those skills wanted to "share them" with the world.