The two who were the architects of the alliance came from within the ranks of Black Faction Corps. Vanessa's keen eye for mathematical anomalies allowed her to identify what her enemies were doing.
She finds them, brings them to her......
She allows one her choice between gun, disintegration or Azologoth...but chooses her own method anyways.
Then she proceeds to interrogate her captive CPD Commander who brokers a deal because she knows the location of the "repurposed" Black Faction Combat Units.....
Vanessa needs to liquidate her "damaged" stock, so begins an internal Black Faction War.