Dunno.
They seem to be signing agreements all over the place, all without their issues.
Gatwick doesn't have much extra capacity
Luton has the issue of AENA funding which is required for expansion to go ahead
Stansted has the Ryanair issue of route competition
I think Easy are keeping all their options open, and rightly so. The Stansted deal is supposed to be over a 5 year period and MAG have been a bit slow bringing the developments on line. I think less than one year since Easy announced the SS deal it's a bit early to be writing it off. If next year there is no increase in PAX then it may be more doubtful.
Have easy stated to take delivery if the new aircraft yet? That may also be halting expansion across the board