The EK flight isn’t affected as it operates late at night when there are few departures, security is not an issue that time of the evening and you’d have a whole choice of places to park your backside once airside. Granted the arrival of EK is mid afternoon so I’m not sure how the airport fares that time of day with incoming flights.
What Stansted needs is another handling agent to add to the mix. Swissport is far too dominant at Stansted and clearly can not cope. Ryanair would be so much better off to go self handling.