I think LGS6753 might not be far from the truth. I was speaking with people from the Manchester Area this week, they were not that happy with the deal because MAG have apparently made it clear that their focus, and money, is on STN at the moment.
Easyjet have made it clear that Gatwick is their preferred airport in the South East. the best thing about the deal from the Stansted point of view is that it means there will not be the total withdrawal of Easyjet that was feared after the flybe Gatwick slot deal