Just as the Nephites were “other sheep” who were to hear the voice of their shepherd firsthand, there are yet other “other sheep” who similarly will have the opportunity to hear the voice of the Lord first hand. The Lord does not identify those people, and to this day we do now know who they were, or where they were. Perhaps their records have not yet been found, or perhaps they were completely lost. Certainly we understand that there will someday be “one fold, one shepherd” as a physical reality. Until that time, there the unity of the “fold” is metaphorical, and relates to our ability to receive the same gospel.