In a recent discussion on D&C 27-28, Patrick Mason briefly addressed the "Elias" issue:
Who Is Elias? | Sections 27-28 | Come Follow Up
His treatment was pretty superficial, though, to be fair to Mason, it was only a brief segment on the topic.
For a fuller discussion, see my work:
"Elias" as a "forerunner" in LDS Scripture
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