Two of the most dedicated Martial Artists I have met, John Mee and Dan Cossor.
John has been continuously training since the early eighties, is very highly ranked in Karate and Muay Thai Kickboxing, proficient in weapons training and BJJ second Degree Black Belt graded under John Will(Will-Machado).
Dan Cossor started his martial arts journey in 1979 also highly ranked in Karate, Muay Thai Kickboxing, proficient in weapons training and also a BJJ Black Belt under Will-Machado organization. Dan has lots of real world experience and despite being a relatively new BJJ Black Belt has an incredible knowledge of BJJ and studies and researches BJJ more than anyone I know.
There certainly is no substitute for time and experience, over 80 years of combined experience. Very fortunate to have these legends coaching and training with us.