That aside, my main comment had to do with werewolves born in the Empire itself, rather than foreigners. While we'll be looking at the Vinca in the pre-Sundering world, it would be a mistake to assume that the wolves centered there-indeed, they were already a global family.
EDIT: Like, for clarity, a small timeline:
The Sundered World takes place around 5500 BCE. Wolf doesn't nessecarily die here, but he dies close to it.
The Shan'iatu murdered Azar and Iset around 5293 BCE. Sometime shortly after, they set out to create the Nameless Empire, which would last until around 3832 BCE.
The Uratha who will be the Dog-Kings of Sumer established Bau at some unspecified time, but their fall was somewhere in King Gudea's reign, somewhere from 2144 to 2124 BCE.
Also, I'm not sure why you would expect post-Sundering werewolves to be stronger. Maybe pre-Sundering? Sure? But the curses of the Sundering surely hit like a god damned hammer.