I have thought of another question just out of curiosity.
If the offspring of the original GG are undesirable, is there not a possibility to make the GG sterile like HSB, Grass Carp, or Tiger Musky?
Excerpt from Robert Crais' "The Monkey's Raincoat:" "She took another microscopic bite of her sandwich, then pushed it away. Maybe she absorbed nutrients from her surroundings."