I think you've missed the significance of one of your own points there Man Flex:
WW successfully changed Aer Lingus from a full service loss making national airline with lots of union issues into a low fares/no frills profit making national airline.
Why would anybody think that this successful strategy should change?
The reason GB and BMed can serve certain destinations profitably where BA can't is the union issues in BA, namely ground staff and cabin crew. At LGW the cabin crew have been screwed by BASSA to the extent that their pay and productivity is broadly comparable to charter airlines and GB. LGW is also an exceptionally junior base for flight crew so the wages for them are the lowest in the company, comparable once again to GB, with Carmen rostering allowing the company maximum flexibility. If WW sorts out the union issues then there'll be no need whatsoever to give more work to GB as the reasons for giving GB the work in the first place will have gone. If WW doesn't want to sort out the unions then what's he comnig to BA for?