I dont see potentiall problem in such temporary alliances. But it is needed in such massive battles to be scaled a bit. IF GRN outnumbered, then fight will not be so interesting. It would be good though that GRN get some ALLY in House through RP secret pact Kusari or even Rheinland. That will bring flavour in ship variety on GRN side. So people flying outcasts to Leeds can fly Samura Kusari fighters.
No wind is favourable for those ships who dont know their final destination