People get too caught up on the thought of trading away the chance to draft Fultz. However, based on the top players expected to be available in 2018 via draft express and the fact that 2019 draft top pick, Marvin Bargley Jr., is a generational type talent. Then it's easy to see the rationale here.
Fultz
for
Jackson, Tatum, or Ball
+
2018 - Doncic, Porter, Ayton, or Bamba
+
2019 - Bagley Jr., Langford, Reddish, or Williamson
Now doesn't the thought of that take people off the ledge? Plus, we could potentially net (pun intended) two of those players in 2018.