I find it interesting that the zoo has repeatedly stated that any future exhibit would have to be able to hold a bull group and a breeding group as a requirement. Could just be an ambitious hope for them, but it looks like this might also be a reflection of a changing standard for new exhibits going forward.
I will say, that's a pretty big ask of several zoos if true. I don't see any reason to push new exhibits to have the capacity for bachelor groupings, especially zoos developing on older or landlocked exhibits.