data-mm-id=”_pso68pwxm”>Brad Stevens is a very good coach. The last five years at the helm of the Boston Celtics have proven that much. But one of his flaws, some might call it, is that he doesn't tend to let the younger guys play through their mistakes. Sure, he did it with Jaylen Brown and Jayson Tatum, but as top-five picks they're exceptions. When it comes to mid- and late-first-round picks in the Brad Stevens era, players have to be nearly immaculate to stay on the court. Some of that is a function of the team's construction. The last few years have granted Stevens a deep enough roster that he doesn't have to play rookies and sophomores because he had steady vets who do exactly as they're asked, even if the upside is low comparatively. That is not the case…