I found a solution to the Grid2 problem when you split people into unused groups (i.e. Butcher). The problem happens because Grid2 does not by default give you the option to layout by group with a higher raid size so if we have 15 people it will only show 3 groups and anyone put into the 4th group will not be shown.
To fix it, go to General Settings, Layouts tab, and then the advanced tab. In the new layout name box, make a name for it (I went with Custom Group 20). In the 'Header 1' fields, do the following (Type = raid, Columns = 1, Units/Column = All, First Group = 1, Last Group = 1, Group by = None, Sort by = Index) in the Action tab choose copy and now change First Group to 2 (Last Group should also be 2). Repeat these steps changing First Group to 3, 4, etc. (4 is all you need for 20 man).
Afterward you can go to the Layouts, General tab and under Raid 15 layout change it to the 'Custom Group 20' layout you just made. I went ahead and made a custom layout for all group sizes 10-40 so that I can swap out layout sizes no matter what the raid size is.