I actually don’t find the morning peak to be bad at all. It was much more crowded before the extension on the occasions all three EZY were in at the same time, and there was just the cafe and smallish upstairs bar. The latter has been moved and extended, the former is still there for now but does admittedly get long queues, plus there’s the additional Bourgee. There always seem to be seats available. It is a far cry from the peak experience at STN/LTN.
I also find that they board the first couple of EZY plus BE to DUB early so by about 06:25 the place quietens considerably. Then MAN boards (admittedly that’s just 25-30 people), after that all you’re left with is the EZY to AMS and the later BE which leaves circa 07:30.
I’d say they could cope with another departure around 06:30 and anything after 07:00 would be no trouble at all. It might be tight if two or more FRs left before 07:00 assuming the current EZY schedule remained the same.