Cincinnati have successfully AI'd an Indian rhino(on more than one occassion now?) so no doubt this has encouraged them to believe they can succeed with Sumatran too. I don't know if it would really be any more difficult or not. Possibly Ipuh might still have a role to play if they need to introduce them to get precopulatory behaviour and ovarian stimulation before AI is actually undertaken.
Because of that possibility, KB's suggestion that Suci's father Ipuh might(I know it was only a 'might') now be better translocated back to Sumatra seems to be not such a good idea, UNLESS Cincinnati received a mature, unrelated male by exchange- Andalas shares the same genes so can achieve the same function breedingwise at Way Kambas. I think the elderly female 'Bina' must be a lost cause breeding wise but now Ratu is pregnant, the Andalas/Rosa combination should work fine too in due course.
But this is such a tiny captive population, it desperately needs some more 'problem' animals which can legitimately be added to this stock, i.e. from places where they are isolated or in extreme danger and could be brought into captivity in the same way as the two younger females were. To me captivity also represents safety, as I imagine few of the 150 or so remaining wild animals are secure or genuinely safe, wherever they are. Critics of that statement will quote the Sungai Dusun disaster but big advances have been made since then and its an even more critical situation now. I would rather see a larger captive population with reproductive potential which is also safe from poaching/logging -than wild rhinos that can be wiped out at any moment.
I also believe that with such a tiny wild population all told, they may have to be prepared to allow some degree of inbreeding among the captive rhinos in the future, as 'unrelated' animals simply won't keep coming available.