By definition the requirements to be be an instructor are to have above average flying skill and the ability to teach. It is on this criteria that you are assessed when you take your instructors exam.
Human understanding is not standardised and therefore instructional technique has to be flexible in order to accommodate this. You cannot possibly learn all the different ways to teach someone to fly an aeroplane on an instructors course, however you will be provided an awareness of the problem and how to deal with it. This is one of the enoyable challenges of being a flying instructor and when you succeed it is most fufilling.
ta ta
MJR