a person who has not established their credentials.
But what constitutes credentials? That's the gist of MY point. Credentials as an instructor are different than credentials as a practitioner. To use the skating example I mentioned before:
(From Wiki... edited)
Yao Bin ... has almost single-handedly turned
China into a
pair skating world power.
In the closed society of mid-20th century China, Luan and Yao had only
photographs from which to learn their moves. At the 1980 World's they finished 15th (in last place). They competed at the World Championships twice more in 1981 and 1982, finishing last both times. They also placed 15th at the 84 Olympics. After these embarrassing experiences, Yao was determined to create a team of world-class figure skaters from China.
(and retired from competition)
Among Yao's current and former students are Shen and Zhao, who he coached to two Olympic bronze medals and seven World medals,
(and other world level medalists)
In 2004 Yao came full circle--at the World Championships in Dortmund, where 24 years prior he and his partner had finished last, Yao's pair teams placed 2nd, 3rd, and 5th. That year, Yao received
International Figure Skating Magazine's Coach of the Year award.
(end Wiki)
If you evaluated Yao on the basis of his own competitive and performance skating skills, he would never be considered a good coach. Thankfully he was in an environment where this did not impede his ability to establish himself as a coach, and he has given the skating world some of the most beautiful and exciting pair teams to come along in decades, nurturing them to the very top of the sport.
However, if you saw a video of him skating, you would probably guffaw and comment (as did the great Irina Rodnina.. one of the most decorated pairs skaters in history) that it was simply comical.