Were the Sellian Sorcerers Heretic Hunters?

In Witchbane Ruins we find the "apostate" witch Sellen's true body held prisoner, along with Ambush Shard, which reads "The Sellian sorcerers were assassins, and it is said that they often hunted their fellows." Later, we meet witch-hunter Jerren here. Jerren was comrades with Radahn in Caelid, where Radahn fought the stars to defend Sellia. Sellia features a massive Golden Order statue, and architecture similar to lower Leyndell.

This all seems to line up with a narrative where the Sellian sorcerers had an especially close relationship with the Golden Order, and may have functioned similar to witch-hunter Jerren. After Radagon became lord in Liurnia, sorcery became aligned with the Golden Order. But not all schools of sorcery are allowed, some are deemed heretical. Miriel, a cleric from an earlier age, says that heresy isn't real. But this has clearly changed, since many sorcerers throughout the game are called heretical, apostate etc.

The Golden Order covers up all kinds of secrets about TLB history and alternative kinds of power. Sellians are descendents of the eternal cities, allies to the Golden Order and Liurnia at one point, and a source of ancient knowledge. The Sellian invisibility abilities seem like a parallel for the sewn mouths on Radagon's preceptors, or the silent footsteps of the confessors: see no evil, hear no evil, speak no evil. I would bet anything that the Sellians killed other sorcerers to hide secrets deemed heretical.

Heresy is but... a contrivance?