Hmmm. Thinking outloud, I orginally had the Neo-Sovs consisting of humans (modified to be "ideal" or near ideal humans-they're working on that pesky aging problem, consider it almost....a disease) and uber-augmented warrior types, originally slave-soldiers for the fuckers they overthrew. So modified the Neo-Sovs consider them a separate species.

Considering extending that now-because why would the ruthless fucks they overthrew stop at augmenting soldiers? I think it'd be an interesting dynamic-the Neo-Sovs are built around trying to preserve humanity as a reaction to the excesses that led to those augmented soldiers, and the other species if I extend-but they'd also need to take care of, involve, the results of said excesses-the augments they consider separate species.

Which could be interesting to explore.