Questions about Witnesses

Whose voice do we hear throughout this chapter? Why is Moroni so adamant about his instruction to whoever translates the Nephite record? How do we know that we can equate the record to a “holy thing?”
Ether 5:2–4 — Compare these verses with 2 Nephi 27:12–13. How many witnesses were to see Mormon’s original record? Why so? See Deuteronomy 19:15 pertaining to the Hebrew law of witnesses. Why would the Lord retain the ancient law of witnesses for a sacred record? Who were the three people who saw the plates? Who were the three sacred Heavenly witnesses of the work?
Ether 5:6 — Moroni testifies that he will stand as a witness of his record at the Judgment bar. How many reasons can you think of for why Moroni repeated this very testimony in Moroni 10:27, 34?