Angry Rat,
I agree with your idea and think it is the way to go on integration. However, Cruise FO's of which Intake may or may not be, hate the idea. That is because when they joined as cruise FO's they had no possibilty of progression unless they had significant hours to meet minimums for a 777 FO (most of whom did not). For the majority their only chance of progression was/is to resign and start again at VAA. So to use this 'Silo' approach leaves them with little as they do not qualify for their 'protected' 777 FO slots.