When you have a unit as strong as Michigan State's secondary, attrition is likely to occur. That happened today at redshirt sophomore cornerback Ezra Robinson announced that he would transfer out of Michigan State. According to MSU's athletic department, the cornerback out of Sarasota, Florida has not yet decided on a transfer destination.
Robinson redshirted in 2012, his first season at Michigan State. During the 2013 season he spent most of his time on special teams, recording one tackle each against Illinois and Indiana as well as recovering a fumble against Youngstown State.
On the surface, this appears to be a case of not enough playing time to go around. Robinson was listed as the backup to the field corner along with Jermaine Edmondson to the sophomore starter, Darian Hicks. While Robinson had a good spring game (an interception and a pass break-up), Hicks also had an interception, and it's more than likely Robinson felt that he wasn't going to see significant playing time the next three years, and is leaving now.
Best of luck to Ezra in his future endeavors.