I think that was the obvious choice for Cyprus.
EGKK is virtually full so not much chance if getting in there.
It was always going to be GW or SS and I image MaG have been aggressive on pricing plus there is more flexibility in operation at the bigger airport.
The fact that the airline has sold Heathrow slots shows how poor a state they are in so you have to wonder if they will last long enough to make the SS operation work