A main instructor currently in the DR right now is Luis Polonia. Because Garvey had a better career than he did in the majors, does that make him a better coach? Do the Cubs not have instructors throughout their system that were once former players? This is all getting blamed on Hendry, but hell, he was a college baseball coach himself, kind of rendering the JC coach Harper knew his whole life kind of pointless in this argument. Castro first got noticed in the DR by the Cubs at a tryout at 16. What, 3 years before making his ML debut? You can think whatever you want about whether potential that hasn't been coached properly for very long will or won't close the gap with a polished player that's received consistent, quality coaching for probably a decade before he played in the majors. But continuing to pretend that there was no difference in the coaching or the period of time it was received is just being dense.