I think an instructor should be certified to dive at a higher level than what he/she can teach. But that's not enough, it should be an active diver in the type of diving he/she's teaching.
I have known of "quarry instructors" who have never set fin in the sea. How can that be? They are limited in their knowledge and in the information they pass on to their students.
And then there are instructors who are actively diving, but mainly teaching. They should dive on their own, do normal proper dives not just with students.
Besides the instructor's experience and training, another related question is how should a prospecting student be aware of how knowledgeable and experienced the instructors are.
A what? Should an instructor need to know the names of every type of diving gear and how they work, even if they don't use it, don't teach it and don't have it available for their students? I had no idea what the i3 was, but come on, is it rocket science? It's not even anything new, Cressi have had the Flight Control system for years, Mares has the Airtrim... all the same thing and if an instructor cannot figure out how they work when they see them, then they are not suitable to be instructors...