Kevin O'Connor's excellent draft board supports the thesis of the OP (me), placing Exum in the first tier of players with Parker, Embiid and Wiggins.
This is my essential point in this thread: If we finish tied with, or worse than, Orlando at season's end, our odds of getting a top 4 pick improve dramatically. Furthermore, I would not be at all surprised if one of Parker, Embiid or Wiggins is available at 4. I have a strong hunch that Exum will be selected in top 3.