I love Brown. It's a risk, I get that. But do a redraft 5 years from now and Brown could be the second-best player taken. That won't be true if Hield or Murray.
I like computer models and analytics. It's part of my profession. But makeup is a huge part of whether or not a player busts. Computer models can't measure drive (well, they could if you gave everyone personality tests and entered them into the model, but that's not going to happen.)
Workouts and interviews can help measure that drive and commitment. When they're out there giving Brown pointers, how quickly does he assimilate things? When he came in for interview one, did they give him some things to work on, with his shot for example, that they saw he'd fixed in workout 2? When they have a film session, how well does he diagnose what he's watching?
I can't answer the questions above, but you could tell how much they liked Brown when they talked about him at the press conference announcing the extensions. Ainge had that glow. Compare that with Jamal Murray, whom they groused about not wanting to do everything.
Maybe Brown's shot will never improve enough to be a star. But I'm certain that they saw enough in him to believe he'll be a rotation player next season, and that gives him a good chance to not be a bust. Of the picks at #3, I thought Dunn was the safest, but Brown was next in line for me. He has an NBA ready body, and I think the skills aren't far behind. I'm also sure he has the makeup.
I hope in a few years someone comes back to this thread. Brown will not be a bust.