Um, well you can recruit certain troops from areas, but it depends on your faction. If you're the Sauromatae, historically Germanic tribes fought with Sarmatians, so you might be able to recruit more of their soldiers once you take over their land than say Rome would..

That is however but an partial answer only. You are still following the OTL (Orthodox/Our TimeLine), wheron the Sauromatae do not expand into say north africa. What happens in case of such a POD as illustrated above and its subsequent ATL, and does EB acknowledge the case for such POD and take measures for accomadating such ATL. That is the moot question.

Finally what is the official EB POV then??