Well, if I remember correctly, Duin was the first Werewolf. I'd have to look up his Civilopedia entry again. You have poked a few holes in my theory, though. Maybe the older Werewolves are just so used to their new forms that they prefer to stay in that state instead of returning to their former state.
Edit: Nevermind, I found Duin's entry.
Like all mortals, even the horrific Duin passed away, but he would not be allowed to sleep forever. In time of dire need, desperate mages performed rites to bring back the greatest, most feared general of history. But it was not without price: the gods knew of Duin's character, and would not suffer him to be raised back to life without an appropriate form.
Werewolves had not been seen in the world since the Age of Ice. Hardly possessed with the same mental faculties as vampires, the werewolves truly were hunted to extinction by the human survivors. But in Duin Halfmorn, these dark creatures will witness a terrible rebirth, and the free peoples would do right to tremble in fear.
But because he was resurrected by the gods, he could be one of those "super werewolves." I don't recommend making another class, though, because anyone who gets the Hairy Baron could end up with a large army of almost unstoppable Werewolves that could wipe out any civilization on a whim. And where's the fun in that unless you're the Infernals?