El Elyon was the Most High God preached by Melchizedek.  The Egyptian king Akhenaten is the teacher who kept alive the doctrine of El Elyón, the One God, thus maintaining the philosophic monotheistic channel.  Kenites believed in El Elyon. 
Moses became convinced his people would never fully comprehend El Elyon. Therefore he deliberately determined upon the compromise adoption of their tribal god Yahweh.  Moses’ father-in-law was a Kenite worshiper of El Elyon, but the emancipator’s parents were believers in El Shaddai. 
See also: UB 96:7.2.