He had a heart attack right before the season started. Anyone who follows basketball knows that an injury at the beginning of the year can totally derail a season, so I can see why a team might expect him to have a better NBA career than his one college season went. Especially when the NBA drafts so much on potential, not college production. Devin Booker was a lottery pick and he came off the bench and scored 10pts a game.
Then, as a late second round pick, he doesn’t have to amount to anything to be a success. If he stays in the NBA for more than a few seasons, he’s exceeded expectations. If he becomes a starter, that’s clearly great value. He doesn’t have to do much to be considered a good pick.