A good sales trainer will always summarize in the end and will ask questions from the participants about what he has taught, what do you think?

Yes this is one of the element of sales training but most important thing is involvment of participants and having more and more practices segments rather to have one way communication.

Yes I agree as he will get2 immediate benefits.

1- He summarize the course and while replying to participants questions he come to know how effected what he taught to them.

2- A good sales trainer always boost energy in his pupil with his communication and Motivational energy.