Good for Zahra! She is joining one of the best and most skilled zoo's at gorilla surrogacy, not to say others in the country aren't just as good. She's got the best future possible in Columbus.
Now Milwaukee can turn its focus back to creating a stable family for Sulaiman and mom Shalia who have had their own huge upheaval loosing Cassius, Naku and Zahra as part of their world. Rebuilding or transfers for them will focus on Sulaiman's journey toward future bachelorhood. Developing brotherly bonds with boys near his own age will be key. Luckily there are a number of other young boys around his age throughout the US.
Other single boys about his age (4 years either way) to the best of my knowledge are...
Denny - San Diego Zoo
Moke - National Zoo
Densi - Jacksonville Zoo
Zachary - Brookfield Zoo
Azazi - Zoo New England
Kayin - Buffalo Zoo
Leom - Oklahoma City Zoo
Abaju - Philadephia Zoo
Ubuntu - Knoxville Zoo
Gus - Forth Worth Zoo
Tracy James - Gladys Porter Zoo
Any of them could move to Milwaukee with their mothers and possibly father or be joined by a new silverback. Or Shalia and Sulaiman could be send to them for integration with their troop. A part of that decision though given Sulaiman's age will depend on where best to place Shalia for her next offspring. Who is the right match for the extremely valuable Shalia. She's got wild born parents.
It will be interesting to see what comes next for Shalia and Sulaiman.