[@Gunther] So much of the IFV conversation was entirely exploratory with the intent of thinking it through ahead of time. Sauna does have some open areas devoted to agriculture which might be effective for IFV's. However, there are lots of caverns, and these are large and urbanized, with what I presume would be rail systems. 

Saina probably does have transport infrastructure, but I don't think the Pilavians are believers in individuals moving around in vehicles, so they might stick with rail and other forms of fixed-public transit because they evolved from animals that relied on a volume breeding strategy to survive. Moving in groups and not being caught out as individuals is part of the psyche. They might even get a little panicky when isolated.

So I'm guessing that the open areas would be A) agricultural areas on the surface and b) potentially underground areas with lots of room cleared out. That'd be a very different kind of MOUT.

Beyond that, it was a straightforward discussion of what sort of IFV might be supporting the Centurion troops directly.

It is also entirely possible that it's more feasible, given the tech and the distances/numbers involved, to dedicate air support assets to them, such as air-drones with 30mm cannons analogous to Cobras or Apaches. (and, overhead, A-10's and AC-130's) The infantry would be entirely air mobile and their dedicated CAS would be drones with no physical crew and lots of loiter time, supplemented by other types of craft to support that effort.

Basically, I think the Grathik are using lots of drone pilots and no human pilots crewing air vehicles except for transports, because they can easily preserve their pool of experienced pilots that way.