Females are the harder commodity here! New holders are far more likely to be allowed to start out with 2 males. Slowly, they will then start thinking of giving out a female for breeding purposes. If all that is successfull, perhaps a second female may be loaned out.
By then a zoo is just 5-6 years down the line. Currently, there is a freeze on new holders in the Okapi EEP. The new holders Leipzig, Dvur, Beauval and Chester must all be seen to be making a real effort to manage these sensitive okapi .....