I never understood Lamar's point about practicing individually anyway, because a good coach will motivate you to do better. You'll want to spend your free time working on your shooting or your defense because you want to be better in practice and in games. Yeah, some guys won't work as hard, and it will show, and they will ride the pine. At least they should.
A good coach isn't someone who has a great scheme and knows how to win games, it's a guy who makes you want to win for him.
He's the guy who shows you something in practice and says "this could be a weapon for you if you work," so you stay late for 2 hours by yourself and work on it. He's the guy who says "this is how you work on your shot" and gives you a new technique to make your shot easier and so you stay late for 2 hours and practice. He tells you not what to do, but how to make yourself better, and shows you examples of where you could be if you worked.
I'm a musician so I've run into this first hand - there are people you want to be "good enough" for and people who you want to impress. No in between. I do not think any of these players feels like they need to impress Hewitt, OR Hewitt simply doesn't react in an encouraging way when they do impress him. Either one of these is poison.
These are 18 and 19 year old kids. They aren't self-motivating, they are there to learn how to be self-motivated. And even if they are self-motivated, a coach needs to use that and guide their methods and techniques to make the most of their motivation.
I'm not trying to rant here but I've met musicians who can get more out of 2 hours of practice time than most can out of 10 because they know how to focus and what to do. These kids need to learn how to focus and learn what to work on. Hewitt isn't the guy to teach them that, at least not anymore.