PressTheTit if they could they would. However a pilot who hasn't flown a heavy turboprop or medium/heavy jet would need 40 line training sectors, if they have it's 20 line training sectors and rated would be 10 line training sectors.
With the amount of pilots who have left the training department doesn't even have enough capacity to train the heavy turboprop or medium/heavy jet guys who joined. They tried to find rated pilots but realised they couldn't find any who were willing to apply and pass the selection.