While on the surface it sounds like a setback, taking a careful inventory may show that you are ahead of where you were last fall as you now have a developed interview process, screening questions, and a potential source for tutors.
Possibly your son has a list of gains from this experience as well, which he can take into the future. For example, the post suggests he was able to develop an open, trusting working relationship with the tutor. Additionally, the experience of having a setback and overcoming it may provide good reflection for content.
Looked at from a distance, this may be seen as a positive trajectory: the current tutor was better than the first... the next one could be stellar.
Hang in there.
