well said Ampster... one particular arm style doesn't really have anything to do with it. It's using the the right placement relative to how your partner is dancing ans also how you've been trained. I've been trained both ways/styles (though I have a preference) and poor training either way ends up causing problems. As you and others have said, it's not the arm placement that's the problem, but the training that makes it work or not work, though you probably aren't going to make any further headway in getting your point across to people that aren't willing to listen...oh well. On pumping arms- I see that now and again. I'm not sure that there's actually any leading going on with it, though I guess there can be, sometimes it's just extraneous movement (like shoulder lifting from the follow) but I am speaking from things I've experienced personally and I didn't watch this video all the way through so I probably shouldn't comment.