As another poster mentioned it is also very possible Brown declined an invitation. That may have been why there was a scramble to get a last minute replacement like Simmons or Exum that doesn't really fit the game.
I doubt it. Brown just doesn't have the minutes or stats to justify a selection. For 1st and 2nd year guys, he's 56th in minutes at 13.5. Everyone else selected plays at least 18mpg. The group avg and the median are both 25mpg.
He's 49th in ppg with 5. The group avg is 11.9, the median is 9.9, the lowest guy selected is 5.9 (Exum).
Now if you want to argue Rozier should have been selected over Exum, I'm with you. But Brown, the only thing he has on his resume right now is drafted #3 (and #1, #4, and #5 aren't going either). Just doesn't have the minutes or stats to warrant a selection.
We all know this is nothing more than a dog and pony show anyway. It's no indication of whose star is set to rise the most. Hopefully he uses this "slight" as a chip on his shoulder though.