While most of these fish are Hybrids in the broader sense of the definition (A. labiatus x A.citronelus et. al) we generally put them in the CA/SA forum, hence the move from the Flowerhorn section. While both species evolved from a common ansestor and are very closly related they both have evolved to fill seperate ecolocical niches and have not (to the best of my knowledge) interbred in the wild, or they would have not evolved into seperate speces. However having said that without the presences of a suitable mate who knows for sure what happens or has happened over the millenia out there, but I digress.
The individual trates your particular fish has inhereted from it's parents will dictate is genetic predisposition for devloping a nauchal hump (note the word kok is not used in this instance and is reserved for refrencing the exaggerated humps devloped in "flower horns").