Well lets see if I can add something to the actual thread content without seeming to be over-defending myself
I was one of the 26 that Umberto mentions in the previous post.
Linda mentions the AA international instructor course requires no previous freediving certification. Well, this is true, and surprised me a little at first. But the idea of going back and doing an Aida 2, 3 and 4 star was just plain dumb for me. I have trained with world class freedivers and already was diving the Aida instructor levels. It would have been a waste of time and money, although I probably would have learned something new and enjoyed being in the water anyway. All AA instructor candidates are pre-screened via Umberto and the network of AA instructors World Wide, it would be very hard even to start with no good free diving reference to ones name. For example, many of the passing instructors had some freediving national record for the country they represent.
Secondly, the whole course is focused on instruction. The way we spoke in class, the way we handled our selves in the water, was all towards the final goal of instruction. At no point was the context solely self-improvement as a freediver, trying PB's etc. Of course, we all improved anyway, but in the context of becoming instructors.
Thirdly, as an AA instructor I am obliged to do more improvement courses every year and maintain my freediving levels or in 2 years my instructor status expires. This for me is key, as it shows the instructors course is just the start of a long term route of improvement and qualification.
Lastly, the 30m dive (we also did 40 on VWT) was the easiest part for 99% of participants, all had done more than that before the course, that was the minimum entry level. The hard parts were doing decent statics and dynamics under pressure (emulating the pressure an instructor may have with a group of students). For many (me too) the swimming tests were very hard, requiring, "perfect" crawl and breast stroke. Not easy under the high pressure context of being able to show that level to a group of potential students.
I would love to be an AIDA instructor too, maybe when I give up my day job

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Simon