What attracts you to Late Rome?

[Flavivs Aetivs]

So Romanization overtook the nomads' lifestyle, causing them to settle down?

A viable solution, but we still don't know where the Huns came from. If the Alans had contact all the way from Rome to china and south to Bactria and Sogdiana, then that doesn't leave a lot of space for other groups.

Could the Huns have been an internal rebellion within the greater Alanic group? I always believed the Huns were a predominately Turkish with a Mongolian/Finno-Ugrian mix. So if they appeared it would have been right in the center of the Alanic territorial influence probably. Internal collapse and an overthrow would be plausible, but i dont know if there is any evidence to back something like that.