Uh, that article is not about house cats vs big cats. The still-extant ancestral species of the domestic cat, F. lybica, is a small wildcat, as were its ancestors, and as such a predator but not an apex predator. Big cats, which typically are apex predators in their respective ecosystems, are a wholly separate branch of the felid family.
The same is true of humans and orangutans, that comparatively small percentage can clearly account for massive differences in behavior and intelligence.
