sorry- I meant outside of Africa...
regarding DNA tests, they would probably show if Amohoro and Victoria are from different populations?
Do not worry, you are cool! I personally know of 2 locations where both graueri and berengei are kept together.
Regarding their status in Antwerpen. Personally, just exhibitting a rarer taxon/taxa of a given species is no help if the sex ratios are not designed for some form of breeding. A showcase for their wild counterparts ... perhaps .. but that also sits uneasy with me. To be frank: I do not quite know what to make of the Antwerpen gorilla group.