I also wondered why they would not have consolidated units to create new units during the WoR, maybe they just didn't have the time to go through the trials associated with it. Well, we have these two beat up clusters so let's combine them... Star Colonel and Star Captains then fight trials for command. Better to just say Star Colonel Jim, Star Colonel Bob your clusters are fighting together until we get this mess with the Society, Dark Caste, Burrocks, Vipers, and Spirits all figured out.
The Adders have always been practical, if the opportunity and need to combine units at 15-20% strength was there I am pretty sure it would happen. Maybe they intend to rebuild based off of what they still have.
Also... if we're going to rebuild units, can I get the 5th back, please?