Seems like it is happening other schools as well and at other positions. Fletcher left UK because of playing time. Terrence Clarke basically just quit midseason for them and you had something similar at Duke with Johnson.
I think part of it is these 5 stars all come in expecting to be dominate like they were in HS and are expecting just a quick stop in college before the NBA. The expectations seem to be out of control for these kids.
And it doesn't help at a place like Kentucky where they've had some generational talents come in and have great success right away. The John Wall, Anthony Davis, KAT, etc. of the world are the exception to the rule with Freshmen.