Folks get real...
EI brings nothing to BA. The slots are shorthaul timings, which BA don't need.
The UK - Ireland market has very low yield, which is why BA withdrew years ago from LHR.
EI was useful in a OneWorld scenario for the feed to BA's LH network, they chose to withdraw.
EI is not worth diddlysquat to LH as it has more slots than it needs via BMI.
EI's only hope would appear to be through the Middle East or O'Leary or I really don't know.