I imagine a conquered Bretonia would end up having its corporations annexed by Kishiro and/or Samura, especially one as useful and potentially profitable as Planetform. While it might still be called 'Planetform', it would be a subsidiary of Kishiro or Samura. It wouldn't be Kusari asking Planetform for help, it would be them utilizing the resources which now belong to them.
And I think the Bretonian/Kusari war has grown beyond control of the Taus, to outright invasion.