His camp knows that he won't fall out of the top 3. Barring injury in the coming weeks, I don't see any particular reason why Boston or Philly wouldn't pick him. Heck, I bet Magic would pick Fultz over Ball if given the chance.
Fultz went to school with CB Sidney Jones at Washington. This spring, Jones tore his achilles working out during the NFL combine. At 6'0, many thought he would have been drafted before Philly at #22.
If I knew I was a lock top 3 pick, I would call the shots too. There's enough in-game tape of him to make an assessment.