Ryanair say they haven't even been approached by IAG yet. Its completely In Ryanair hands then as to wheather they sell or not. I'd say they will bit MOL is rather unpredictable then isn't he?
MOL looks after company he runs, getting €400 million means can distribute to shareholders or pay down debt.
Ryanair have lost nothing on this deal as IAG will likely have to divest London-Dublin slots.