If it wasn't for Ib, Ba would have the same debt they had before the merger.
Hmmm, a little thin on the 'factual' ground that one.
BA's debt was based within it's pension deficit. The restructuring of the pension schemes, abolition of the final salary pensions scheme and readjustment of the employee contribution and employer contributions were all agreed with the pensions ombudsman well before IB came on the scene.
Nothing to do with IB money that IB seems perfectly adequately capable of throwing to the wind without any help.
IB made small profits in the biggest boom era know in recent history. Once the pinch was felt it has dropped rapidly into the red. It will take hard work and painful adjustments to change a flawed business model.