I understand Garey Maley will be the 4th goalkeeper in line to play for Livi and will be substitute all season in case DJ gets injured or sent off in a 1st team game.
One of the young goalies will then be recalled from emergency loan if DJ is out through injury or suspension. If DJ had been out playing every season on Saturday's from 2009 to 2013 instead of warming the bench, he would probably have been the clubs number one earlier and be a more experienced and better keeper.