Tigerair had about 13,000 slots per half year. Last season Rex had access to half of these. Certainly will have problems if Virgin get them all back. But the SY-ML flights are empty so who cares, perhaps focus on another part of the country.
I recall Bonza have already said they tried Mascot but no slots. Perhaps next March. Can you imagine the $hitstorm should Bonza get allocated some Tigerair slots with Rex. Sharpy will go into meeellltdown.