Jabari Parker is in the expected one and done group. They are the players who rented college for one mandatory year before hitting the NBA.
Unfortunately he took the one and done strategy to the NCAA tournament. The Dukies got upset in the first round and he laid an egg. He never got to experience the fact the regular season is boring compared to the tournament. Each game grows exponentially in importance and the closer you get to the Final 4 the hotter the flame gets.
His college "career" now is really a busy and if he goes the the pros he will be a footnote in Duke and college history. No Carmelo-like dominance. Just a good year and a tourney bust.
Hopefully he will get to experience going deep into the NBA playoffs sometime.
Outside of that his one and done was a waste of time.