There is a huge problem here. People who use this sort of training in their daily work, people who teach this type of RBMA, students who learn it and the OP video produced by an ex military man instrumental in setting up and teaching this sort of training to military, police and civilians all over the world ( Martial Arts Biography - Tim Larkin ) vs a couple of sport based grapplers who reckon they know everything. Go figure! As I said, if your life depended on it I know who's advice I'd be taking.