Frank Moore Cross, who has exposed in greatest detail the rivalry between priest and Levite, thinks the conflict is specifically between Aaronid priests and Mosaic, or Mushite, priests (Canaanite Myth and Hebrew Epic [Cambridge, MA: Harvard Univ. Press, 1973], pp. 195–215); see also Friedman, Who Wrote the Bible? I do not doubt that there was a Mushite priesthood, but I think its traditions are not preserved in the Bible. In a specifically Mushite text, Moses’ sons would presumably play a greater role.