Yes. The availability of many posts depends on the decision of the current incumbents to renew or not renew their contracts. This decision may well take place after the interviews. A recruiter handling several schools cannot ensure that he is always interviewing for 'firm' vacancies. or possibly 'firm' would be a better word because you were a tyro and he knew what he was talking about. Possibly a bit strong but it would apply in many cases. I hope that doesn't mean you will be put off applying because the professionals decline to do it your way. It is a VERY competitive market so why create unnecessary obstacles to your success?