Interesting stuff a Crazyguy ? I was thinking of a quote from theology.edu that said yahweh may have been viewed as a son of El, but as you say, it is not clear. Another quote I read said Yahweh at most was seen in Ugarit as the god of tempests.
As I said above the Jehovah of the WT, being in fact Yahweh, has murky origins.
The slow evolution from Pantheism, through Henotheism to an eventual Monotheism saw Yahweh change quite a lot !
Monotheism rather went out of fashion once the christian trinity got going.
As to your group of power hungry Priests in Jerusalem I am sure you are right, maybe the group got its start around the time of Josiah,and was still influential upon the methods used by the returnee priests from Babylon. These guys, Ezra in particular, had a huge need to cultivate an "us and them" attitude, hence their promotion of the cult of Yahweh, and of him as the only god.
They may well have been responsible for "restoring" (inserting) the name to their own Scriptures, much like JW/WT today, the motive not being accuracy, but control and power.