Meant to include this in original post, editing it in now but also posting it here
If we DO consider the tevinter-imperium-deliberately-reshaping-elven-mythology angle:
By transforming him into a trickster god, they not only get rid of "rebellion" as a theme but turn him into someone to be distrusted & wary of. This way, if any lore DOES survive intact, Elvish slaves are still unlikely to trust it--it could just be another of Fen'harel's tricks to mess with them again. Get rid of the idol for uprising as well as aquire a scapegoat, two birds, 1 stone, etc.
AAAAAND ANOTHER THING: we have OTHER proof of Tevinter messing with elvish history in the constellation codex entries from the Astrarium quests.
For some of the constallation entries, it's noted that some scholars suspect the Tevinter Imperium overwrote/displaced older, Elvhen constellations--usually ones of the Elvhen gods. Specifically, the constellations below all mention that they could actually correspond to the listed god:
In all these codex entries, it explicitly mentions the corresponding god, along with some handwavey "~BUT WE DON'T HAVE CONCRETE PROOF THAT THAT'S THE CASE GUYS~". If they did that just once, I'd be inclined to say it wasn't much, but since it happens for 6 of the 16 constellations, it seems like a pattern to me.
So: possible proof of erasure of Elven mythology by the Tevinter imperium? *dons tinfoil hat* Maybe!! Maybe also unintentional loss.
HOWEVER: we DO have proof that Tevinter DID make a deliberate effort to change at least one of the constallations on purpose to make them look better--Satinalis.
"Referred to as either "Satina" (after the moon) or as "Satinalia" (after the holiday) in common parlance, the constellation Satinalis has always been depicted by the Celebrant: a seated man playing a lyre. It should be noted that, in ancient Tevinter, the constellation was known as "Mortemalis," and was represented by a warrior holding aloft a head (usually that of an elf). The movement to officially rename it took hold in the Divine Age, and after eight hundred years, the original is all but forgotten."
Interestingly, of the other constellations we get, a lot used to represent old gods but have also changed, whether on purpose or not.
So! Basically:
- Did Tevinter purposefully supplant parts of Elvhen history to keep their slaves timid & obedient? There's evidence they may have at least replaced the constallations with newer versions that no longer corresponded to the Elven Gods.
(Why did you memorize all the constellations, you may ask??? Because I freaking loved those puzzles. I did them all. I'm like the only one apparently. And stuff like that just sticks in my head easy. Maybe it's not the best line of support for crackpot theories but I am new to this theory-game & I'm bringing what I can).