Is mentioning Germanwings as a possible operator from SEN speculation or are they reliably known to be interested?
What Aer Arann of course could do is establish some sort of mini-hub at SEN if they operate to place like ORK, WAT and GWY from the west and some Benelux / Western German destinations from the east.
However, I remanin sceptical until I see RE planes in SEN. IIRC, a couple of years ago RE announced a base at LGG in Belgium - which never materialized.