I look at it like this; "loan" the aircraft and crew to SNN three days a week helps keep four aircraft and crew at ORK. Keeps the guys and gals on the hill in jobs and this can only be a good thing. I know DUB/SNN crews fairly regularly operate out of ORK, so this may be a way of rotating SNN crews more efficiently onto ORK routes.
Who knows maybe one day we could "borrow" an A330 from SNN