An excellent point, and one that Lamb made in his article.That is a GREAT point. Just because you can do something well, does NOT mean you can teach it. Ive seen guys with incredible resumes of operational experience fail miserably when trying to relay those skills to others...
A good trainer will also TAKE training in addition to providing it. Because 1) no one knows everything and 2) techniques/tactics evolve and improve and new techniques/tactics are developed.In my 40 years plus, as a firearms instructor I've been to many instructor development courses.
A really good wakeup call for people who don't get training because they believe they already know too much to learn from trainers would be to see how much time, money and effort good trainers spend on taking training themselves.