Sorry flippinnoraable, but most studies and research are conducted over a very short time and very poorly done. From those pathetic studies, the researchers jump to some "probable" conclusions. Credible research would have to be conducted from start to finish, over the entire learning process. Show me the studies which have done this. If there were a study done on ALG that showed students who started Thai from scratch, followed the requirements precisely, and came out with similar levels of acquisition, then how could it be disputed? What would there be to dispute? Language acquisition is measured by the end-results. Results are not disputable. Only theories are disputable. Why? Because a theory is theoretical. Results are not theoretical, they are factual. Therefor, the dispute about any research can only apply to theory. You cannot dispute results. So, exactly which SLA research has shown any results? Which has shown how students can become fluent native-like speakers? You've never read any. Researchers never do experiments that long. They haven't the time nor the money. There is no research anywhere that follows language learning from start to finish. If you find such a research paper available online, please post a link. Krashen has never done any experiments that completely back up his theories.Of course, what I mean by not being able to dispute results is something like if the result is blue, then it's blue. You can compare blue to another blue and if they are the same color then what is there to dispute? If you were to compare a fluent native-like speaker to a native-born native speaker and they were the same, then what dispute could you have?
I don't blame you for wanting to make informed choices. I'm not saying there is anything wrong with what you are asking for. I'm just saying that the research doesn't exist. All you want is proof, right? Well, you are in Thailand, so why don't you see if you can find some ALG graduates and talk to them? Bring a video recorder with you and get us the real proof. I suppose you have some excuse why you won't even try to do that.
You could always dispute whether Benny is fluent in the languages he says he is, but once he reaches native-like fluency, then there's no more point in trying to dispute it.
And that's the way I see ALG (Automatic Language Growth). If you start from zero and don't try to cheat, you'll be able to reach native fluency. I would like to see some of their students who have achieved this and would like to hear or read testimonial from some native Thai speakers who can verify it. But so far, no such videos have been made.