Maybe, I am breaking a tradition here. But why would Jersey need to hold on to its gorillas if they have not been breeding successfully for so long? Is it not time to give the 3 females that display to him a chance at another zoo instead so their genes will become represented better in the zoo population? Is Bekesbourne or the new family group at Port Lympne not a good home?
Ya Kwanza could stay as part of a male bachelor grouping.

And his genes be preserved by electro-ejaculation and freezing (the frozen zoo). I think much of it has to do with his history of social ineptitude (his early upbringing in Oz).