It would be interesting to see if Rex also rehires redundant ex Virgin crews, or whether they'll upgrade their existing turbo-prop pilots. We all know which is the cheaper option, so would they go for the cheaper option, or reward their loyal long serving pilots with a jet transition?
CASA will force them to have a percentage of crew being already experienced on type beyond that it's up to the airline. From what I have witnessed the transition later in life from long term turbo prop experience to a 737 is challenging.