I missed the Lorkhan worshipers - can you be more specific?
I dug up on this since taking up my Reachwoman character for RPs. If you take the Sithis = Lorkhan route you have the dark brotherhood, I guess. The Third Pocket Guide, in one of its countless morsels, tells us that the Witch-Queen of Whiterun, Jsashe calls herself a Priestess of Lorkhan. Before this, Witches normally seemed to be crude Daedra worshippers, as far as I know.
And then in Skyrim we get Briarhearts. If that is not mantling, then I don't know what is. Skyrim actually did give us a fair bit of lore to play with, though not all of it is immediately obvious, in the form of new religious texts, or so on. But the rituals of the Forsworn and the Hagravens point towards a whole new area of magic, we'd be doing a disservice by merely seeing as daedric-meddling. The fact we are given
so little to go on is actually kind of fun, in a different way to Morrowind's excess. Let's not think about Oblivion.