Cabarceno is a breeding group and won`t accept anymore needy elephants, certainly none which are non-breeding or having social problems. Terra Natura had due to economic reason to downsize its elephant population and moved most of their older females out. They only kept the 4 youngest females and the proven breeding bull. I don`t know if they are in any position to take new elephants now, but you bet that they would only take females in breeding age to "use" the potential of Luka.
From what I have heard, Noah`s Ark will also house a group of 2-3 related females and a bull- ergo ANOTHER breeding group.
There is definately a big, big problem in europe to house older, non-breeding females, especially those who have been exposed to diseases like TB or herpes and who are difficult to integrate into existing groups due to their character (f.e. very dominant).
All zoos with good/ new enclosures want to breed, which is good and much-needed, but that leaves only zoos with old, outdated facilities for non-breeding females. Given that older females are often dominant and often have social problems due to their life histories, they are bad candidates for those small, outdated enclosures that can house 2-3 elephants max. What usually happens now is that these older females (either from zoos where they are not compartible with the group or from circusses) - due to a lack of alternatives - are placed in zoos with outdated enclosures and when she doesn`t get along with the other elephant(s), well, one has to move again. And again. This is not a good situation. Just look at the situation in Burgers Zoo. It`s good that they are taking older females, but a good place for older females should have at least 2 good-sized outdoor enclosures so that females like Rupa can stay and don`t have to be moved through half Europe to the next zoo, even though it is totally unkown if Rupa will get along with the elephant she is housed with in Italy.
It seems to me one of the founders of this project is an (ex?) elephant keeper from Antwerp Zoo, so there is at least one person who has a lot of hands-on knowledge with elephants, incl. a bull.