i don't wanna fight his battle fo him......... but he was adding to your correct drill not critiqueing it. you must have been describing and upright or 2-planer and he was elaborating on how a rounded or 1-planer should do your drill so as not to confuse and have rounded swingers using your drill and screwing up their swing. i have never seen anything that he said to be wrong, though i have been confused before by them lol. but i think he just has a lot of knowledge wants to try to clarify posts and make sure incomplete info isn't given as there are two kinds of swing round/upright and some people give advice and don't say what kind of swing it is for so he elaborates on it. with gregs drill too, he didn't critique it nor correct it (as it needs no correcting) but there are aparelty 3 ways to accomplish the same things and elaborted more on how/why gregs works and spoke of 2 other ways to achieve the greg is trying to achieve with his drill