While we are a bit off topic........... The real issue is not the method, but the capability of the player to turn knowledge into sound. There was more than enough info on how to play back in the 19th century (the 18th century had trumpet guilds that kept the good stuff secret). There are several takes, but mine is: there are the natural talented that are just lucky, there are those who have the gift of working hard and moderate talent and there are those without a snowballs chance in hell (no opportunity or no talent or both). This is why I am very critical of methods PROMISING results. It just ain't so. It is also not fair to assume that the player is stupid if the method does not work - there are too many variables. When talent - in whatever quantity, and opportunity (playing, teaching) meet, the player thrives. No method can work if it falls on deaf ears. A method understood by the student will at least get to first base. If it is fun and the student has the impression that they are getting better, the method has at least made it to second base. If it REALLY works with this person, third base and if it results in employment - Home Run!