There are a few different explanations out there for why Moroni never tells us the name of the Brother of Jared. But in my reading of Ether this week, I wondered if there might be an obvious one we've been overlooking: artistic choice.
At the beginning of Ether, a man named Jared has a relative who reaches the heights of personal spiritual experiences. And in the middle of Ether, a man named Jared has a relative who reaches the depths of personal satanic behavior. Is it possible that the choice to use the name the "brother of Jared" was done to contrast with the later "daughter of Jared"?
I've recently begun reading Joseph Spencer's An Other Testament (so far, not a fan), and he makes a big deal about the stylistic choices made by the Book of Mormon authors. Perhaps this is an example of another one.