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Mike Krzyzewski isn't John Calipari. Sure, Coach K has four national championships compared to Calipari's one. Krzyzewski has been able to have more consistent postseason success because of his approach to recruiting and the types of players he has brought to play at Cameron Indoor Stadium.
Yes, Calipari did win a national championship in 2012 with a starting lineup of five underclassmen. Up to this point, winning it all with one-and-done players has been the exception and not the rule however. Krzyzewski has still been able to bring in top-notch talent, though most of his players' collegiate careers last longer than, say, a player on a Calipari-coached squad.
In 2010-11, freshman Kyrie Irving was an early-season star for the Blue Devils before going down with an injury that kept him out until the NCAA tournament. Irving left school following a Sweet 16 loss to Arizona and was the top pick in the NBA draft to the Cleveland Cavaliers.
The following season, Austin Rivers was a top freshman talent who chose to play at Duke. Rivers never jelled with his teammates and was pegged as a selfish player. Rivers' collegiate career ended in an opening-round loss to 15th-seeded Lehigh in the NCAA tournament.
The Blue Devils now have another probable one-and-done player, this being Jabari Parker. Parker is a 6"8" small forward from Simeon in Chicago, where he won four straight Illinois High School Association titles. Parker will be an instant impact player and is a high-character person.
To say that Parker's addition, though potentially brief, hurts the Blue Devils would be foolish. Rather, I think it's safer to say that Duke national champion teams were led by veterans, regardless of whether those squads were Coach K's most talented ones. Parker hopes to change that, though.