Why change who the domestics are? Put simply: control.
Think about it. Before the, er, um, "further clarification", the domestics only included the anointed. The great crowd was part of Jesus' belongings. Thus, they claimed authority over all of Christ's belongings, which included the great crowd. Now, however, the GB says they haven't been appointed over all of Jesus' belongings, yet, but to maintain control, they make the great crowd part of the domestics so they can still say they have authority over them.
That's so sly and sneaky that it almost got past me.