I don't think that the Control Medal would actually merge with a Zoacrystal. As they are completely different types of biological technology. The Zoacrystal provides the user with enhanced strength, powers and psychic abilities. While the Control Medal in a Bio Booster Unit acts as the CPU for the Bio Booster Armor, and acts as a user input device for allowing the host to use the Bio Booster Armor. Essentially the Control Medal is nothing more than a computer, while the Control Medal can take control over the Bio Booster Armor if the host has been rendered unconscious or has had their brain damaged or destroyed. It's main function is to regulate the units power output, the armors essential functions (healing) and the activation of the armor's weaponry.