Yes, thats for the same reason a legitimate BAF wing could never use OC weapons, if they did, Liberty would find out and Bretonia would probably loose the close diplomatic bond they have, and if Bretonia lost their only strong allies, the war would be over. The QCP on the other hand, are not a 'legitimate' wing, and them using OC weapons could be condemned by the Bretonian gov, keeping relations with Liberty good. The legitimate houses cant be seen to be siding with or aiding pirates and criminals, so the KNF would be obliged to force Corsairs out of Kusari, as the BAF would never use OC weapons.