Giving up #16, #28, Avery Bradley, and Sully for pick #4 in a three deep draft seems kind of insane to me. If we want Turner, which I'm not sure we do, then we'd just stay at 8. If we get to #4 we aren't taking Turner.
Either we are praying one of Towns, Okafor, or Russell slip to 4 or we would stay at #8 and probably take Turner, WCS, Winslow, or Hezonja, one of which would almost surely be available.
Maybe we are trying to land two top 10 picks.