Primates have quite different behaviors in captivity even if Baboons would fight like this in the wild captivity can seriously aggravate this as without natural selection there might not be a clear hierarchy within the tribe so the order of succession could be very different and without a clear heir due to the fact that they tribe does not have to worry about food or predators. In any case there is nothing wrong of removing an animal from the group if it's life is at risk it's already does not follow the natural order. Removing specimens due to violence or otherwise adverse group interactions is very common in many cases they will relocate them to another pack in another zoo and try it again there.