O'Leary is a guy who saw the parental worry about Tommy John, started making a few GIFs, and sold his "program" to tons of concerned parents around the nation. He landed a few big-name guys, like Matt Harvey (seriously, read his excuses on why Matt is injured or not performing well, all begins with when he stopped working with O'Leary, according to O'Leary, that is), and really became the first real big user of the "inverted W" term. Of course, that has been incredibly debunked, but he still is out there schilling the same stuff.