QUOTE(ghastley @ May 8 2017, 06:00 PM)
That's a reasonable divide. Person<->animal is Hircine's job. Permanent "hybrids" aren't.
Consider also that in Skyrim, Hircine seems to enjoy the hunter becoming the hunted, which fits the lycanthropes he created very well.
I think it's also worth mentioning vampires. Both vampirism and lycanthropy are diseases that can be imbued by the Daedra Lord that created them, gifted from one person to another, or simply inflicted upon a victim. These similarities suggest something of a hallmark of daedric handiwork. Becoming a hagraven on the other hand is a ritual, seemingly setting it apart from other Daedric transformations.