I think people are over reacting a bit. So maybe he had a few and went to bed late and forgot to set his alarm. Not the end of the world.
We don't know his home life, his life on the college front. Maybe he had no mentors to look up to, some one to steer him straight. That could lead to all sorts of immaturity problems.
But one of the first things he said was Kyrie Irving!!!! So he's going to a team with a guy he looks up to. Also mentioned Horford. Two vets like that taking him under their wings can set a guy straight.
DA can also set him straight from a business stand point. Show him what his first check will look like. Tell him if he does A,B,C, in a few years that check amount gets bigger, if he doesn't do A,B, and C, (he rips up the check).
I new a kid in highschool that was constantly in trouble. Watched him pick up a kid and slam him into the table and beat his butt. A few years later I ran into him, he was a contractor. In the off season he went to Haiti to build houses, and in the summer he would fly out a few of the better workers that he worked with to be part of his crew so they could make money to send back to their families. Complete 180 in a few years.
Heres the thing, he's the 27th pick. If it clicks for him, and he gets it, what a steal. If it doens't click and he doens't grow up with having a good support system in place. He's the 27th pick on a already REALLY good team.