Outcasts and Corsairs, given the scale and nature of their operations, would need not battleships but Carriers, first of all.
Motherships, even, as a core of pirate fleet with repair facilities etc.
These 2 factions need Heavy Carrier-class ships (and i'm talking about Heavy Carriers in terms of the amount of stuff they have to carry, not in terms of their firepower - mothership, in other words) most. Bit even a Light would do, better than nothing.
So yeh, if they'd end up having "too much heavy capital ships", replace one of battleships with a carrier, would be more logical.
