It's because of how borisin culture works.
The borisin are masters of biotechnology, and use it to manufacture weapons, armor, and spaceships, as well as modify their own bodies. Their weapons and armor have some characteristics of living beings, while their spaceships, called mechabeasts or beast ships, are living beings with the ability to feed, attack, and reproduce. They have been known to enslave and modify members of other intelligent races to attack and plunder planets.
I imagine Our dearest Herald having a borisin collaborater his counterpart for Lloyd who is crazy for biological research and sees even child suzaku as a peak specimen for his work. Also the scientist would be terrified of Jingliu due to her reputation.