Ted may wanna be a cowboy when he grows up, but clothes don't make the man. And those large cattle-eatin' animals ain't gonna last long in Texas. Too many hunters as well as ranchers who don't want/need more livestock predators.
As I remember, Texans are able to lawfully shoot cougar as varmints. Other cats would be dealt with similarly, I would be willing to bet.
We also don't need African rinderpest infecting non-resistant American livestock and decimating herds, or tsetse flies bringing in sleeping sickness.
Lions are over there for a reason. Elephants are over there for a reason. These guys need to leave it alone.