Well actually yes, over the last 20 years I've had the opportunity to study with several Japanese instructors, non of whom have invented their own "style" My first instructor was trained in Japan and most recently, my exposure to the sword line within Sosuishi Ryu was likewise with an instructor who'd spent a decade in Japan and is a legitimate Shihan.
..//.. I don't pretend to be able to quantify 'effective' in terms of sword work, and it wasn't what I was referring to in the first place. Effective suggests you have a benchmark to compare it to, and aside from perhaps a few people in the world you don't precisely have Samurai-class swordsmen you can spar with to compare, do you?
Well I did preface my comments with "but"
..//..And yes, it did seem a bit rude, but I understand that somebody in this forum would have a well justified frustration with phony and suspect martial arts and teachers.