I think it’s quite telling they’ve chosen some routes that aren’t served from STN, and that can’t be served from overseas because they have no or limited operations there. This to me shouts lack of capacity. For all the talk of playing STN off against other airports, the reality is that if they did move aircraft 4,5 and 6 over the vacant slots and stands would be snapped up by Jet2, Primera or someone else.
This seems more like LTN mk II in terms of route mix, somewhere else of course they can’t expand at because there’s no capacity.
I’m not saying individual routes won’t shift around as has been seen between STN and LTN - Copenhagen and Malta for example started out at the latter - but I don’t imminently see the aircraft moving over