Re: NLP in martial arts.
In the early days, Bandler and Grinder did use hypnosis. That is because of their extensive study of Milton Erickson, a medical hypnotist. However, he referred to them as Bandit and Swindler. Later they dropped the emphasis on "hypnosis" and began to think of consciousness as a trance state.
IMHO, Ross Jefferies demonstrates that lack of ethics that became the downfall of NLP. There was a severe split between those who followed Grinder and those who followed Bandler.
NLP as a vocabulary and technology can aid the understanding of mental discipline and training. It will never replace good physical training, but can make that training more effective and efficient in skill acquisition.