For the purposes of the survey, I'm in 'stage 3', and I have to say it's been fantastic, particularly getting into 'stage 2' and the transition from stage 2 to stage 3.
John, for sure, we don't have enough data here to make any conclusions about what the fruits of Kechari will be, or would be, for a randomly chosen person.
We could ask a number of questions about kechari in terms of cause-and-effect, and hypothetically, do a number of different studies to determine the answer.
1. What are the probable fruits of advanced kechari for a randomly-chosen person?
2. What are the probable fruits of advanced kechari for a randomly-chosen person already enjoying considerable fruits of 'Advanced Yoga'?
3. What are the probable fruits of advanced kechari for a randomly-chosen person already enjoying considerable fruits of 'Advanced Yoga' and who feels very ready and motivated to do 'Advanced Kechari'.
It isn't practical to do all of the studies actually (you cannot randomly choose people and get them to do kechari!), but in principal, there are results for such studies. My reason for considering them is to expose some of the principles of 'applicability' and how it would affect results. My expectation is that as you go down the list, the probable yield gets considerably higher -- that is to say, if you are highly motivated for kechari, it might suggest better chances of good fruits from it.
Another interesting question is:
What are the probable fruits of advanced kechari for a randomly-chosen person, not already enjoying considerable fruits of 'Advanced Yoga' but who feels very ready and motivated to do 'Advanced Kechari'.
I can say I have no idea of the answer to that question. Maybe I'll have a better sense of the answer some time. I'd love to know the answer to it because then I could recommend kechari more generally.
I agree with you that kechari is not essential for enlightenment. I don't know, in fact, of anyone who believes it is. But it's another great tool in the toolbox, as a number of the yogis here will attest. In my case, it's been a real power-tool. But we aren't a sect of Kechari-ites or anything who think everyone has to be into kechari.