I think having a person who is great both will be awesome to convey knowledge but I think teachers are more cut out for it. For me, I view it that teachers are more able to package the information better than doers. Doers often present the information as a matter of fact, which can be great too in certain situations, such as practical aspects.
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When you train someone for a specific job or skill, doers who have teaching abilities are better, because they know what works and what doesn't in the field and they probably present more updated information and to the point.
But for the first stages of learning, good teachers are always better.