Nobody that has a chance to be drafted lottery, even top 20... , first round at all, prefers to go back to College to play in Washington State. Maybe he could have taken his chances in the second round, I certainly don't remember him being highlighted at all but he was probably in somebody's radar, but for sure it wasn't a case of him having any sort of guarantees at all or else he'd be in the NBA already.
Also, the hype is out of control, nobody except for the most crazed of draft people knew much about him until a couple of months ago, I had interest in him as a second rounder because of his interesting profile going through draft boards, but there was almost no talk about him and certainly nothing even remotely close to your description. I'm not bashing him, in fact I think he's a solid candidate at 14, but he's almost 22, has had serious injuries (shoulder injury with cartilage damage that required surgery and an entire season to heal, and I don't remember exactly but there were others before that), his lateral mobility isn't great, his defense is mostly theoretical (a lot of it is projection on measurables), etc.
As for his interviews, I watched one and it was ok, it felt a little coached and forced at times, like he was trying to sell himself too hard, but nothing that would have you rave about for a 22 year old. All in all a prospect definitely worth taking a long look at 14, but not someone I'd go crazy about overpaying to secure as he isn't risk free either.