If Brown at his young age is already good enough to play NBA defense (in his first season I mean), that's pretty special in itself.
Of course we have lots of wing defense already and lack shooting, but that can be sorted out over time. We have no real slashers on the team. Turner is closest but to call him a slasher is a bit exaggerated.
So, (if Brown is added), trade one of the non-slashing wing defenders, add a shooter in free agency and another shooter later in the draft, and there goes all the bemoaning about being overloaded with defense and lack of outside shooters.
Free agent shooters: Batum, the French Orlando guy, etc...
Late draft shooters: Beasley, Valentine, Korkmaz, Prince, D. Jackson (don't laugh could happen), T. Ulis (don't laugh could happen), Wade Baldwin (don't laugh could happen).