...All I've said is I find the SLA rules a bit fuzzy which explains why so many that have tried to apply them - including me - have failed. I don't think the error is on the student in this case. Not necessarily on the teacher, either...
It doesn't matter what the method is...most are going to fail while using it while only a few will not fail. That's just what happens when learning a discretionary method (something that's not automated from start to finish).
Further, the issue really then isn't the student/teacher...its really the student/student. Thus, what are "the few" doing that "the most" are not doing. That's the real issue (question) in my opinion and something that may not possibly have an answer.

