While it‘s true they are talking about Roto 18 being "entirely" reservists, this is a bit of a misnomer because at the end of the day you are going to get Reg Force augmentation for positions that just can‘t be filled, probably at the last minute to boot. Also, certain specialists are also going to be a "must be" Reg Force position.
What is going to be truely interesting to see is if they can get the Snr Leaders out from the Reserves to make it tick, particularly since those with the time and inclination to take a year off of their civilian job are being used up on Rotos 11, 12, 13...