Having taught music and dancing at various points in my life, I've noticed that -- at least in these sorts of fields that require some sort of body mastery -- the best teachers often weren't the most naturally gifted. They often had to struggle and reason their way through issues in ways that the most gifted/natural musicians/dancers didn't. And because of that, they were often vastly superior teachers simply because they had learned how to think about and articulate a given subject. They could translate the wealth of techniques they had developed to learn the subject to others.
And perhaps, having struggled themselves, they would be more patient.
True, that's all ad hoc theorizing on my part, so I wouldn't promote that as some sort of universal truth, but it's something that I've heard from lots of musicians.
(All of the above is tangential to the OP, btw, which I don't necessarily find that compelling.)