Think about it: all Genomes are essentially braindead, androgoynous, pretty teenagers with tails. Kuja, Zidane and their sister Mikoto are the only ones with any proper sentience and Kuja is considered a failure specifically because he refuses to submit to Garland. Zidane is also considered one. And Mikoto is so damn repressed that it's depressing. Oh and all the Genomes wear skimpy clothes. That's right, Kuja doesn't wear pants because his home doesn't even have them! (I lie, Garland wears them but he's the sole exception)

Yeah, the evidence speaks for itself...