Remember the A380HD for EK is going to be a 644 seater. And Unless BHX is getting more than that number of pax per day, it's remains a candidate for a "2 into 1" EK special. Especially if the BHX figures remain so much smaller than MAN even when they are generating 1768 pax per day in peak periods (assuming you mean both services operating at full load).
The lack of cargo space is something that may be eradicated using a dedicated freighter service.