Link chose overlooked, inconspicuous lower-class thugs from the West District for his experiments specifically because they were easy to control.
There was no need for Link to act personally, he merely sent out the Brotherhood Group, or even the Social Phobia Group, and they could handle the five thugs easily.
However, Link did not drop his guard or become careless because of the ease of control.
He not only sought a precious confidentiality contract from the Serene Wizard but also left more than one fallback within the contract.
If the five thugs were pawns of someone or some people wanted to make a quick buck, the fallback would end their lives in an instant.
As for whether or not the original contract given to Linn would be lost or stolen, there was absolutely no need to worry.
Once the contract is signed, the original contract turns from a medium of Rule Power into a signal relay station.
Only those whom Link grants authority in a special way can trigger the contract.
