IMO, he has top 5 value at the least, considering his contract/skills/trajectory. All you have to do is look at the top 5 players picked in every draft to realize that not only do you have to wait for them to develop, but that they also can end up disappointing. Most GM's, and organizations, simply don't have the patience for that.
I would not trade him for a top 5 in this draft. Celebrini, obviously, probably Eiserman and Demidov, but after that ... too early to say for sure, but is Dickinson or Catton a sure thing to be better than JEE?