Or they’ll simply type their existing crews and get upto speed with a small amount of initial cadre guys.
That is also possible of course. However that doubles the training cost, move a F100 to the E190 and now you have to train an E190 pilot and a F100 pilot to replace them. The ASX release said that the F100 remains "core" and "in service for many years to come". The Embraer is the "growth" machine.