Last I heard from battery staff was they were hoping to have the new guy in for Houston which will help the battery and overall group performance. There are areas in the show where that snare starts or enhances the book. Once the missing brass players are in that will really help the visual program, when a member of any section is out it affects the movement of the props . They take 2 performers to move them a lot of the time so if someone is out then vis staff has to get another MM to change what they would normally do in the vis program to move the prop which influences every aspect of the show vis , music and effect