One thing I am not seeing on this thread is what training pilots are receiving to detect an unlocked IAE engine cowling.
Of course, I am old school, but if an item on the type of aircraft I was flying was a problem, I knew the gotchas in detail and how to protect myself.
Wouldn't it be appropriate to train each pilot flying with the IAE engines to properly close the cowl by themselves, just one time, so that they can see the issues up close and personal.