The harsh reality is that the vast majority of major incidents in Ryanair have not been caused by low time skippers. They have nearly always been flown by guys with five figures in their total time column. The, ahem, "low level circuit" in Cork a few moons back is one that springs to mind. The man in the left had over ten thousand hours on 737s and should have known better.
DECSFOs? The last intake of so called "fast track" SFOs circa 2005/2006 was a very unsuccessful project. The plan to upgrade them within six months to a year was, with a few noted exceptions, a flop.
Many SFOs in Ryanair approaching command are leaving. It's not really worth it in financial terms and certainly not worth playing the wheel of misfortune that is the basing policy after upgrade. That must be a problem in the making. Although with the expansion slowing in the near term they may be happy to get some DEC bums on seats and keep the sims humming with P2F F/Os.
Time will tell.