Has the boys left Libera?

This seems to be an on going topic in different forums on the web. The latest question is about Oliver Cole, Tom Cole, Michael V., and Zack Lockett leaving Libera. It is the policy of Libera to not metion who has left the choir. In most cases its up to the parents of the boys if they leave the choir. Sometimes the boys do not travel to concerts and others it could simply to  much schoolwork such as the case with Tom Cully not going to Southern California this past Spring.