Hehehe! True!
Ah and another thought, teachers are often idolised and held in an almost 'god-like' status, and often have alot of projected unrealistic expectations upon them from students. And alot of students get disappointed when they don't marry up to be this absolute pinnacle of knowledge, but instructors are people too and not perfect. So I think a great part of this is how the student frames and hold the instructor in their perception, realising that whilst they have a great deal to impart and to be open to their teachings, that they can't teach them everything. I reckon a good teacher will recognise that, and won't pretend to know more than they actually know. Goes with previous posts in this thread, that they're honest about what they know and don't know.
But a big part is how the student holds the teacher, and also how they click with them. Some 'good teachers' are great for some students, and others just do not suit some students, and therefore those students would probably suit better to move on to find an instructor that suits them. Like when I was teaching piano, some students from other teachers were transferred over to me from other teachers who the students just didn't 'click with', when they came to me it was a better fit and they loved the lessons and we're able to learn, and vice versa!
Which is why I'm excited to start looking around for a new style (which is very very soon once all is in order hehe), previously I didn't really feel I had a choice (when I did, but didn't realise it at the time), but now I can really test this out and see which teacher and dojo I really click with.