Here's the thing. As with Booker and Wiggins, Brown would probably have more bloated stats, but would have been learning bad habits, like:
Forcing the issue instead of making the right basketball play.
Shooting too many mid-range shots
Not chasing guys over screens
Not rotating on defense correctly
Not spacing the floor correctly for teammates
What Stevens is doing is not visible in the box score. In fact, Brown's stats would be better on a worse team. What Stevens is doing is preparing Brown to be a force in the playoffs against the best players.