Because no one art is complete. If a martial artist can't admit that, they need to stop training.
Alan Orr uses other arts mainly to compete in tournaments. Nothing wrong with this and I commend him on his vision.
Even Kevin Chan who is a Brown Belt in Gracie BJJ admits that BJJ is a sport art. It works effectively in many situations and even self defemce scenarios but if you try and grapple someone in the middle of a pub fight you are sure to get your head kicked in by his mates
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