Nah, seems he has plenty of test subjects to do that. So far he doesn’t show extreme sadistic nature, just being stupid. I mean this guy spent early chapters complaining about how pointless is Xeno program, yet despite having complete control over it he resumed it and even made more.

Drill Sergeant Arch Dornan would call him «A MO-RON!!!» Wait, wrong sci-fi universe.

More likely the eventual rulers of the planet once they’re freed of those cages all at once. I’d like to see Wally try and maintain control if all those doors opened at once.