I've actually watched this video long before this post. This brings up a great discussion. No one wants to hear they are wrong or doing it wrong or even the possibility that they may be wrong. Just like in elementary school a child asks...Well how do you know??? The other child responds becuase my momma said so.....Then no one questions them. It's great to question the arts and the what how and why. Great post. One of the reasons I love jiu jitsu so much is.....the ability that it's left open ended for all sorts of questions and customization to ones own personal style. Hope to see more posts soon!