yes you are right. For experienced FOs on A320 there is no transition to Ryanair FO.
but for the rest they can easily get Captains on A320 from Wizz and offer a Captain position on the 737NG/MAX
same for cadets. Pay scheme in Ryan for cadets are really progressive and good
the thing is that there will be a “war” between them and the easiest way to damage the other company is “steal” pilots. And 90% of the bases offered by Ryanair are much more attractives, on top of that much better salaries, union recognition and rights etc etc