This is what people need to consider when speculating on whether any particular species will end up at MZ or WORZ: Does it fit into 2 of these categories or not? If the answer is no, then it is highly unlikely that Zoos Victoria would bring them in.
We have heard so much speculation and so many opinions on everything from Indian rhinos, to tapirs, to porcupines, to fennec foxes, to okapis and bongos and leopards etc. But when you use this "chart" (so to speak) you will eliminate most species I would think.
Let's do a test run:
Name: Fennec Fox
Recovery: NO
Ark: NO
Ambassador: NO
Enabling: YES
Research: NOT SURE - BUT PROBABLY NOT
Judging by the criteria, it suggests that Fennec Fox will not be coming to MZ or WORZ any time soon.
That said, this is a rough guide - perhaps the enabling aspects of fennec fox outweigh the other criteria in the eyes of the powers that be, or maybe the view that "they are cheap and easy to get, so why not" may sway a decision. Of course there may be individual members of management who specifically push for certain animals and that may get one species across the line etc - but if that is the case then it would be the exception rather than the rule.
Note that Black rhino would tick YES to the first 3 boxes - but then they would be far more difficult and expensive than fennec foxes - so it's not a perfect science.
The sixth category:
That’s very true and to expand on your idea, we can actually create a sixth category: Feasible - Can the species be accommodated within the space Melbourne Zoo has available? Is it suited to display in a city zoo? Is it cost effective when you consider how else funding could be allocated?
When we use this sixth category, we can rule out black rhinoceros (not suited to a small city zoo), Giant panda (astronomical rental costs that detract from other projects) and Common hippopotamus (not suited for a city zoo and require water filtration infrastructure almost equivalent to the exhibit space needed) among a multitude of examples - all of which would appear to otherwise fit Zoos Victoria’s criteria.