Very true Astro,
and during the checking process at REX the "knife" is particularily sharp when it comes to command candidates. But a good performance on the day doesn't necessarily make up for a real lack of experience on either type and/or the operation. Commands at REX are now running at less than 8 months! I've got in excess of 5000 hours on type, and I'm still finding things that I haven't seen before!
God willing, the total experience level in a REX cockpit of less than a year will not lead to an incident or worse. A situation that REX management are apparently comfortable with!