I see Brown as a 1 to 3 with the potential to grow into a 4. He would be a better ball handler than Exum. His decision making is better, faster and he is not a straight line runner like Exum. There is some wiggle and deception. It is hard to say it, but the number 5 pick/Exum is just a role player.
Brown is a big wing who can create. His role would be like Hayward's or Lance Stephenson's. Basically canned soup.