One wonders in such situations why it is just one airline "picked on". Looking at the Gatwick board, the 13 Easyjet were some of their arrivals between 0700 and 0900, and most of their departures just between 0800 and 0900, presumably the returning aircraft. Meanwhile everyone else has operated pretty much to time.
It's the same when issues happen at Heathrow, BA do scads of cancellations, often including dropping the entire domestic operation, while other operators continue to provide their full timetable.