PAXboy, being a 'civilian' I wouldn't expect you to understand the tedious technical details of airline crewing, so I'll put it as simply as I can for you.
A) Ryanair do not operate long haul heavy crew routes. Does that mean anything to you?
Probably not...but who cares, eh...least of all you I expect.
B) The mainstay of the Aer Lingus medium haul fleet is the A321/0. None of the 'no frills' companies have ever bought an airbus aircraft. Do you know the reason why...or the implications that has for crewing?
Thought not.
Get down the back and just drink your G&T you numbskull.