You never know about Max Holloway not wanting to fight here. Honolulu to Brisbane flight time is about the same as to New York. Plus of course the Poly support he would have in the Oceania region. A card with those two fights as main and co-main would be massive for the sport in the region.
Bit unfortunate that Tony would need to have 2 more fights to win the undisputed belt given his age and record already in the div. Just seems like one of those fighters who won't get the recognition he deserves after his retirement if he never wins the belt.
As for who I would favour. Really hard to say. Two of the longest winning streaks (Max 13 and Tony 11) in the whole of the UFC going head to head. Tony leaves a lot of openings in the striking exchanges and Max can find his chin with his accuracy but doesn't have KO power. Tony's unpredictability will enable him to land a big elbow/ backfist or two that will have Max in trouble at some stage IMO. Both guys with unreal gas tanks and chins so I say it's a 5 round war. I'd say it's primarily a stand up fight with Max able to avoid the TD. Max by split decision if I'm forced to pick but don't feel good about picking against Tony.