OK hear me out, what if the Republic does not totally concede? Maybe some Republic units go rogue and hold some former Republic worlds against the Wolves? I mean where the hell are the Hastati/Triarii/Principes/Fides units? Where are the regiments of the Stone's Brigade? I am sure a few many will go mercenary or even rogue, but many may take advantage of the Wolves and Falcons licking their wounds to consolidate surrounding worlds. Some may even work with the Capellans to attack the Wolves. Expect the Highlanders, you can never trust the Highlanders. Johan Levin and many Paladins/Knights are still around, he may form the core of a new resistance.