Gregory M.
I agree completely that the Bible introduces many prophets who were not authors of the biblical record. It certainly is not a requirement. John the Baptist is one such example, Jesus called him the greatest prophet! Ellen White, like all prophets, can indeed be compared directly to Moses, as all prophets are inspired by the Holy Spirit.
John the Baptist by announcing the first coming of Christ, was declared to be the greatest of prophets (including Moses). I suspect we will find that Ellen White, like the Baptist holds a very special place among the prophets. She, her calling, like the Baptist, was to announce and prepare a people for the 2nd coming!
Two of the most momentous events in the history of the Universe! A very special calling indeed.
She tells us exactly what her work was: "My commission embraces the work of a prophet, but it does not end there. It embraces much more than the minds of those who have been sowing the seeds of unbelief can comprehend." (Letter 244, 1906) She was MORE than a prophet.