In that case I recommend having them be related more to Liotrent's stuff.

My personal suggestions is that they could be a more developed off shoot of an imperial caste Liotrent mentions that developed to have more specialized military castes and is more independent thinking compared to the general hives due to how they make clones instead of rely on a queen while enslaving the other mantids for the shit work like spartans in Greece did.  They sound like they use similarish tech anyways, so they may share similar tech even if your military tech is more advanced.

They don't need to be space faring to be powerful and you can always have a "empire armed the barbarians" fuck up from another player in the back story to justify having space faring capability.

Though in terms of physical design they sound like cave dwellers so they fit into Ezekiel.  Only difference is that they may due to the lower gravity have soldier castes that take advantage of the low gravity, cavern and mountain filled environment of Ezekiel.

I swear I fixed the image.  I see it on my end.