There's no feeding to be done by easyJet to NAI's BFS operations. That tie up is a fairly lame
PR stunt involving LGW operations. The second A320 will just be a capacity booster possibly with the addition of a couple of holiday destinations to mix it up e.g. Venice (again).
If easyJet were thinking out of the box they'd put a NEO in and clean up on NI's Canadian market...but never gonna happen. Too much politics involved for that and too far north of LTN.