there are off display cos there are getting them used to people and their are building their enclosure
Bulldust.
All the off-display animals were born in captivity and there is no reason they would be any less equipped to deal with people than, say, the red pandas that were put straight on display.
As for building enclosures, sorry but I don't believe the spin. I've seen Australia Zoo's visitor numbers estimated at 700,000 which, at about $50 a visit, is a cool $35,000,000 coming through the gates each year. That's before they sell a single Stece Irwin figurine, photo with a snake or box of popcorn.
I have long been convinced that Australia Zoo have no intention of putting those animals on display, at least for as long as they are the only ones of those species in Southeast Queensland. They are so overbearingly commercial an operation that I see no reason to suppose that they will put on display for the price of admission what they can get people to fork over a couple of hundred bucks to see.